Luyện nói tiếng Anh bằng Shadowing qua video: How do stem cells work in the body?

Whenever there is an injury or a challenge to an organ or tissue, a whole process of renewal takes place in the body to help restore optimal health.

Soon after the injury, the affected tissue releases specific compounds that travel through the blood to the bone marrow.

When the compounds released by the injured tissue reach the bone marrow,

these messengers tell the stem cells in the bone marrow to divide and create new stem cells, which are then released from the bone marrow into the bloodstream.

Slowly, the number of stem cells increases in the blood circulation.

At the same time, the affected the affected tissue releases another compound called stromal-derived factor 1, or SDF1, that attracts stem cells.

As stem cells circulate in the fine blood vessels of the affected tissue and sense the presence of this compound,

they stop in the blood flow and migrate into the tissue.

Inside the tissue, stem cells slowly migrate to the very site of injury where SDF1 is being secreted.

When they reach the site of the injury and come into contact with the damaged tissue,

stem cells begin to multiply and then slowly transform into cells of that tissue.

Through this process of amplification, one stem cell can become thousands of tissue cells.

It is through this natural process of renewal that the body maintains optimal health every day of our lives.

Stemregen is a natural product made of plant extracts

that have been documented to support the release of stem cells from the bone marrow, thereby increasing the number of circulating stem cells.

More stem cells in circulation means that more stem cells are available to participate in the process of tissue repair.

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Vocabulary and speaking notes for this lesson

This C1 speaking lesson is built on the video “How do stem cells work in the body?”. The speaker keeps coming back to these words: cell, stem, tissue, marrow, bone. This video has 16 sentences and 284 words to shadow. The speech runs for 2:02. The speaker talks at a steady 140 words per minute, a comfortable pace for shadowing. Only 73% of the words are among the 3,000 most common in English, so the vocabulary is demanding.

Key vocabulary in this video

The 15 most advanced words in the video, with pronunciation and meaning:

Word	Pronunciation	Meaning
marrow noun	/ˈmæɹəʊ/	The substance inside bones which produces blood cells.
circulate verb	/ˈsɝ.kjʊˌleɪt/	To move in circles or through a circuit.
migrate verb	/maɪˈɡɹeɪt/	To relocate periodically from one region to another, usually according to the seasons.
renewal noun		The act of renewing.
optimal adjective	/ˈɑptɪməl/	The best, most favourable or desirable, especially under some restriction.
circulation noun	/ˌsɝkjʊˈleɪʃən/	The act of moving in a circle, or in a course which brings the moving body to the place where its motion began.
amplification noun	/ˌæmplɪfɪˈkeɪʃən/	The act, or result of amplifying, enlarging, extending or adding.
bloodstream noun	/ˈblʌd.stɹɪim/	The flow of blood through the circulatory system of an animal
injure verb	/ˈɪn.d͡ʒɚ/	To wound or cause physical harm to a living creature.
multiply verb	/ˈmʌltɪplaɪ/	To increase the amount, degree or number of (something).
stromal adjective	/ˈstɹəʊ̯.məl/	Of or relating to a stroma.
derive verb	/dɪˈɹaɪv/	To obtain or receive (something) from something else.
messenger noun	/ˈmɛs.ən.d͡ʒɚ/	One who brings messages.
extract noun	/ˈɛkstɹækt/	Something that is extracted or drawn out.
thereby adverb	/ðɛɹˈbaɪ/	By it; by that; by that means, or as a consequence of that.

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	being secreted · have been documented
Thì hiện tại hoàn thành have/has + quá khứ phân từ — việc đã xảy ra nhưng còn liên quan đến hiện tại	have been documented
Mệnh đề quan hệ who / which + mệnh đề — thêm thông tin về người hoặc vật	cells, which are

Pronunciation to watch

The “sh” and “zh” sounds: circulation /ˌsɝkjʊˈleɪʃən/, amplification /ˌæmplɪfɪˈkeɪʃən/
Long words — get the stress right: circulation /ˌsɝkjʊˈleɪʃən/, amplification /ˌæmplɪfɪˈkeɪʃən/

How to practise with this video

Listen to the whole video once without speaking and note the words you do not know.
Shadow it sentence by sentence at normal speed, repeating each one until your rhythm matches the speaker.
Record yourself and compare with the original, paying attention to words like marrow, circulate, migrate.

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 →

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