Luyện nói tiếng Anh bằng Shadowing qua video: The Hunters: Sundews & the Venus Flytrap

Chọn chế độ luyện tập

Mỗi chế độ mở một phòng luyện tập toàn màn hình.

141 câu

Nếu các câu quá ngắn hoặc quá dài, hãy bấm Edit để chỉnh sửa.

A plant that hunts.

A leaf that snaps shut in a tenth of a second and counts to two before it does.

This is not a single weird mutation in a single weird species.

It is a whole family, a small one, that turned its leaves into traps and runs on electrical signals like a nerve.

Welcome to Droseraceae.

About 250 species, give or take.

Almost all of them carnivorous, and almost all of them living where the soil is too poor to feed an honest plant.

It is a small family doing something enormous.

The famous one is the Venus flytrap, Dionea massipula, the leaf that closes in roughly 100 milliseconds.

But the family also built the sundews, Drosera, which catch insects on sticky tentacles, and Aldrovanda, the water wheel plant,

which does the fly trap trick underwater, with no roots at all.

Three genera, three different traps, one impossible idea.

Stop eating dirt and start eating the things that crawl across it.

It is also the family that engineers study when they want a machine that grabs without a motor.

Charles Darwin thought this family was wonderful.

He spent years dropping bits of meat and egg onto sundew leaves and watching them curl.

And in 1875, he published a whole book about it called Insectivorous Plants.

He was right to be delighted.

This is the family that proved a plant can move, can count, and can digest its own prey.

all with no muscles and no brain.

Let's start with the snap.

The Venus Flytrap does not close because it is fast.

It closes because it is loaded.

The open trap is a leaf held concave, bent outward like a bowstring drawn and waiting.

That shape is unstable.

The leaf is storing elastic energy the way a spring stores it, and it is held there by turgor pressure,

the water pressure that keeps every plant cell rigid.

When the right signal arrives, the pressure changes, the leaf buckles, and it flips from concave to convex,

from open to closed, in roughly 100 milliseconds.

That is the fastest movement any plant makes.

But the trap is not a hair trigger.

Each half of the leaf carries a few trigger hairs, and a single touch does almost nothing.

The plant needs two touches within about 20 seconds of each other before it will spend the energy to close.

The two touches can land on the same hair or on different ones.

A raindrop will not fool it because a raindrop does not struggle and it does not tap twice.

One touch the plant remembers.

A second touch it acts.

A living timer with no clock.

And if the second touch never comes, it forgets and resets.

Once it closes, the trap narrows and only seals tight if it keeps feeling the prey move.

Then it forms a sealed pocket, a kind of stomach, and the leaf opens again days later, empty.

It is a counting plant, and what it is counting is electrical.

A Venus flytrap fires an action potential, a spike of electrical voltage, the same kind of signal that fires down your own nerves.

When an insect touches a trigger hair, ion channels in the cell membrane open, calcium floods in, and a voltage wave races across the leaf.

This is the clearest demonstration we have that plants have excitable cells.

They have no nerves and no brain, but they speak the same electrical language your neurons use.

The first person to measure it was doctor named John Burden Sanderson who wired up a flytrap in the 1870s

and watched the voltage jump.

Two spikes, about 20 seconds apart, and the leaf buckles shut.

The signal is all or nothing, just like a nerve, and a weak touch fires the same size spike as a strong one.

The sensitive plant, mimosa, folds its leaves the same way, on the same kind of electrical fire engineers have noticed.

The flytrap's snap is a bi -stable mechanism, a structure with two stable shapes that flips between them,

and that is exactly the trick people want for soft robots.

Copy the buckling leaf and a gripper can grab fast with almost no motor

and almost no power because the leaf does the work and the energy is already stored.

And if you put electrodes on a plant and read its action potentials, you have a living sensor,

a plant cyborg that fires when it is touched or stressed or thirsty.

Farmers are already wiring crops this way to catch drought before the wilt shows.

The plant is already wired.

We are just listening to it.

The sun dews, Drosera, do not snap.

They stick.

A sundew leaf is covered in tentacles, each one tipped with a bead of glistening mucilage, the dew that gives the plant its name.

To a fly, it looks like water or nectar.

It is glue.

The insect lands, touches a droplet and is caught.

The nearby tentacles sense the struggle and slowly curl inward, holding over the prey and pressing it against the leaf.

The movement is not fast, it is patient.

A sundew can take hours to close around a fly.

Then the leaf secretes enzymes, proteases that break down protein,

phosphatases, esterases and the sundew digests its meal right there, on the surface and absorbs what it needs through the leaf itself.

The whole leaf becomes a temporary stomach and when the meal is done, it resets, unfurls and waits for the next visitor.

With roughly 240 species, Drusera is the most diverse group of carnivorous plants on Earth and it grows on every continent except Antarctica.

Australia is its great stronghold, with species that survive dry summers as underground tubers.

Darwin called the sundew one of the most wonderful plants in the world.

The chemists have noticed too.

The same digestive enzymes and the same wet, sticky, self -cleaning surface are exactly the properties people want for biomimetic materials,

adhesives that grip, digest, and let go without leaving a residue.

And then there is the family's strangest member, Aldrovanda vesculosa, the waterwheel plant.

It is a Venus flytrap that gave up on land.

It lives underwater, floating free,

with no roots at all and its traps are tiny snap traps strung along a stem like the blades of a wheel,

which is where the name comes from.

Each trap is only a few millimeters across, and it snaps shot on small aquatic creatures, water fleas and mosquito larvae,

in a fraction of a second.

It is among the fastest movements any plant makes underwater.

Same family, same snap, a different medium.

With no roots, Aldrovanda takes its minerals straight from the prey it catches.

It overwinters as a tight little bud called a turian resting on the bottom until the water warms.

What is remarkable is that the snap trap evolved more than once, even within this one small family.

Dianaea on land, Aldravanda in the water, and the flypaper trap of the sundews is a third design entirely.

Three genera reinventing the trap again and again, as if the family could not stop solving this same problem.

Aldravanda is a single species, and it is now rare, scattered across the old world and declining almost everywhere it still survives.

It has already vanished from large parts of its old range.

Carnivory, though, is not a Drosaraceae invention.

It evolved independently, over and over, in at least six separate lineages of flowering plants.

The tropical pitcher plants, Nepenthes, belong to a separate family, Nepenthesae.

The American pitcher plants, the trumpet pitchers of Saracenia, the cobra lily, Darlingtonia, the sun pitchers,

Heliamphora, belong to another separate family, Saraseniaceae.

100

The Australian pitcher plant, Cephalotus, sits in a family of its own.

101

And the corkscrew plants, Genlicia, and the bladderworts, Utricularia, are yet another family,

102

Lentibulariaceae, with traps that suck prey in underwater.

103

Different ancestors, different traps, the same answer.

104

Why does it keep paying?

105

Because these plants do not live where food is easy.

106

They live in bogs, wet, acidic, nutrient -poor ground, where the nitrogen and phosphorus a plant needs are locked away or washed out.

107

A normal plant starves there.

108

A plant that can fly trap or glue trap or pitfall trap the insects wandering through gets its minerals from the air.

109

One bug at a time time.

110

It still photosynthesizes for energy.

111

The trap is not for calories.

112

It is for fertilizer.

113

But carnivory is not free.

114

Building a trap and making digestive enzymes costs the plant something.

115

So it only pays where the soil is poor and the sun and water are good enough to keep the leaf alive.

116

And the pitcher plants do not even move.

117

They just wait with a pitfall full of fluid at the bottom of a slippery tube.

118

The worse the dirt, the better the trap has to be.

119

Which is exactly why convergent carnivory is not an accident.

120

It is a solution that evolution keeps arriving at.

121

And here is the part that should not be true.

122

The Venus flytrap, the most famous carnivorous plant in the world is native to a range you can almost drive across in an afternoon.

123

It grows wild in a thin strip of the Carolinas, within about 75 miles of Wilming to North Carolina,

124

and in a sliver of South Carolina beside it.

125

That is almost the entire wild range of the species.

126

And it is being stolen.

127

Wild flytraps are dug up by the thousands and sold because a poached plant is cheaper than a grown one.

128

In North Carolina, digging them up is a felony, and still they disappear.

129

On top of that, the bogs they need are drained, paved, and fire -suppressed until there is nothing left to come back to.

130

The flytrap depends on fire the way a pine forest does to clear the competition and let the bog stay open.

131

By any honest accounting, it is an endangered plant, protected by law and still declining,

132

with a wild population that is a small fraction of what it once was.

133

So here is the only ask.

134

If you want a Venus flytrap, buy one that was grown in a nursery.

135

There is no reason to buy a wild one.

136

Nurseries propagate these plants by the millions, by tissue culture, for a few dollars each, and a cultivated flytrap is healthier,

137

legal, and not stolen out of a bog.

138

If you ever see one in the wild, look, take a photograph, and leave it exactly where it is.

139

The plant that eats insects should not be eaten by us.

140

Subscribe.

141

There is a lot more weirdness down here.

Tải Ứng Dụng

Mọi thứ bạn cần để nói trôi chảy

Chấm điểm AIChấm từng câu nói

Luyện IPAThành thạo mọi âm

Từ vựngMở rộng vốn từ

Game Từ vựngHọc qua chơi

Quét QR

Download on theApp Store Get it onGoogle Play

FOR YOU

Video gợi ý

296 câu

Từ vựng và ghi chú luyện nói cho bài học này

Bài luyện nói này dựa trên video “The Hunters: Sundews & the Venus Flytrap”. Những từ được nhắc lại nhiều nhất trong bài: plant, trap, leaf, flytrap, snap. Video này có 141 câu và 1774 từ để luyện shadowing. Phần lời nói dài 12:24. Người nói giữ tốc độ đều, khoảng 143 từ mỗi phút, vừa sức để nói đuổi theo. Chỉ 71% số từ nằm trong 3.000 từ tiếng Anh thông dụng nhất, nên từ vựng khá khó.

Từ vựng quan trọng trong video

15 từ đáng học trong video, kèm phiên âm và nghĩa:

Từ	Phiên âm	Nghĩa
trap danh từ	/tɹæp/	bẫy
leaf danh từ	/lif/	lá
prey danh từ	/pɹeɪ/	mồi
insect danh từ	/ˈɪn.sɛkt/	sâu bọ, côn trùng
nerve danh từ	/nɝv/	thần kinh
wire danh từ	/ˈwaɪɚ/	dây, dây thép
trigger danh từ	/ˈtɹɪɡɚ/	cò
voltage danh từ	/ˈvəʊltɪd͡ʒ/	điện áp, hiệu điện thế
enzyme danh từ	/ˈɛn.zaɪm/	enzim, men tiêu hoá
buckle danh từ	/ˈbʌkəl/	khóa
meal danh từ	/ˈmiːl/	bữa, bữa cơm
stable danh từ	/ˈsteɪ.bəl/	chuồng, chuồng ngựa
soil danh từ	/sɔɪl/	đất
stomach danh từ	/ˈstʌmək/	dạ dày, bao tử
steal động từ	/stiːl/	trộm, chôm

Cụm động từ bạn sẽ nghe

Từ	Nghĩa
break down động từ	hỏng, hỏng hóc

Ngữ pháp trong video

Những cấu trúc người nói dùng nhiều nhất, kèm đúng cụm từ trong video:

Cấu trúc	Trong video
Câu bị động be + quá khứ phân từ — nhấn vào việc xảy ra, không phải người làm	is loaded · is held · is already stored
Thì hiện tại hoàn thành have/has + quá khứ phân từ — việc đã xảy ra nhưng còn liên quan đến hiện tại	have noticed · has already vanished

Phát âm cần chú ý

Âm “th”: thin /ˈθɪn/, tenth /tɛnθ/, thirsty /ˈθɝs.ti/
Âm “sh” và “zh”: fraction /ˈfɹæk.ʃən/, wash /wɑʃ/, evolution /ˌiːvəˈluːʃ(ə)n/, tissue /ˈtɪʃ.(j)u/, demonstration /dɛmənˈstɹeɪʃən/
Từ dài — đặt trọng âm cho đúng: electrical /ɪˈlɛktɹɪkəl/, underwater /ʌndɚˈwɔtəɹ/, temporary /ˈtɛmp(əˌɹ)ɛɹi/, evolution /ˌiːvəˈluːʃ(ə)n/, mechanism /ˈmɛk.ə.nɪ.zəm/

Những âm người Việt thường gặp khó:

Cụm phụ âm cuối — đọc đủ từng âm, đừng nuốt âm cuối: insect /ˈɪn.sɛkt/, digest /daɪˈd͡ʒɛst/, evolve /ɪˈvɑlv/, curl /kɜɹl/, solve /sɒlv/
Âm /tʃ/, /dʒ/ và /ʒ/ — tiếng Việt không có, đừng đọc thành “ch” hay “gi”: voltage /ˈvəʊltɪd͡ʒ/, digest /daɪˈd͡ʒɛst/, pitcher /ˈpɪt͡ʃ.ɚ/, genus /ˈd͡ʒiːnəs/, endangered /ɪnˈdeɪn.d͡ʒɚd/
Âm /æ/ — mở miệng rộng hơn âm “e”: trap /tɹæp/, snap /snæp/, fraction /ˈfɹæk.ʃən/, photograph /ˈfoʊ.təˌɡɹæf/, calcium /ˈkælsi.əm/

Cách luyện với video này

Nghe hết video một lần, chưa cần nói, và ghi lại những từ bạn chưa biết.
Nói đuổi từng câu ở tốc độ bình thường, lặp lại mỗi câu đến khi nhịp của bạn khớp với người nói.
Ghi âm giọng mình rồi so với bản gốc, chú ý các từ như trap, leaf, prey.

Phương Pháp Shadowing Là Gì?

Shadowing là kỹ thuật học ngôn ngữ có cơ sở khoa học, ban đầu được phát triển cho chương trình đào tạo phiên dịch viên chuyên nghiệp và được phổ biến rộng rãi bởi nhà đa ngôn ngữ học Dr. Alexander Arguelles. Nguyên lý cốt lõi đơn giản nhưng cực kỳ hiệu quả: bạn nghe tiếng Anh của người bản xứ và lặp lại to ngay lập tức — như một "cái bóng" (shadow) đuổi theo người nói với độ trễ chỉ 1–2 giây. Khác với luyện ngữ pháp hay học từ vựng bị động, Shadowing buộc não bộ và cơ miệng phải đồng thời xử lý và tái tạo ngôn ngữ thực tế. Các nghiên cứu khoa học xác nhận phương pháp này cải thiện đáng kể phát âm, ngữ điệu, nhịp điệu, nối âm, kỹ năng nghe và độ lưu loát khi nói — đặc biệt hiệu quả cho người luyện IELTS Speaking và muốn giao tiếp tiếng Anh tự nhiên như người bản ngữ.

Phương pháp shadowing: đọc hướng dẫn từng bước đầy đủ →

Luyện nói tiếng Anh bằng Shadowing qua video: The Hunters: Sundews & the Venus Flytrap

Chọn chế độ luyện tập

Tải Ứng Dụng

1,000 Flies vs. Venus Fly Trap

Color in Nature – Quiz Edition

Queen Ant Clones Another Species

神奇的植物自卫术 - Valentin Hammoudi

How Did Ancient Humans Survive the Deadliest Predators on Earth?

All About Jellyfish

You're Not Hallucinating. That's Just Squid Skin. | Deep Look

How the Web-Shooter Works

5 Fun Physics Phenomena

Unit 5 A Bug's Sleep

The Insane Biology of: The Octopus

I Added Animals Into My Giant Rainforest Vivarium