跟讀練習: What is radiation? - 通過影片學習英語口語
選擇練習模式
每種模式都會開啟全屏練習室。
50 句
如果句子過短或過長，請點選 Edit 進行調整。
1
Music What do smoke detectors,
2
emergency lights, and nuclear power all have in common?
3
Radiation.
4
But what exactly is radiation?
5
Thanks to high school science class, most of us have heard about radiation.
6
But many of us may not know exactly what it is.
7
I'm Julie, and I work for the Canadian Nuclear Safety Commission.
8
Simply put, radiation is the release of energy in the form of moving waves or streams of particles.
9
This energy can be low -level, like microwaves and cell phones, or high -level, like x -rays or cosmic rays from outer space.
10
These are known as non -ionizing and ionizing radiation.
11
But if we really want to understand radiation, we need to go inside the tiny world of the atom.
12
Remember that high school science class?
13
Atoms are the microscopic building blocks of all matter in the universe.
14
Everything around us is made up of atoms, from the largest galaxies to our own bodies.
15
The center of the atom is called the nucleus.
16
That's where the word nuclear comes from.
17
There is a tremendous amount of energy inside.
18
The nucleus of an atom is made up of two particles, protons, which carry a positive charge, and neutrons, which have no charge.
19
Outside the nucleus are electrons, which carry a negative charge the attraction of these negative electrons to the positive nucleus is what keeps the atom together.
20
Now, every element in the periodic table has a specific number of protons and neutrons, but sometimes an atom will have too many or too few neutrons.
21
When this happens, it becomes unstable or radioactive.
22
An unstable atom is called a radioisotope.
23
For example, two extra neutrons in a hydrogen atom creates the radioisotope tritium.
24
That's the stuff that helps make exit lights glow in the dark.
25
Radioactive atoms want to become stable again, so they release energy until they get back to a balanced state.
26
This process is known as radioactive decay, and there are three main types, alpha, beta, and gamma.
27
Alpha particles are heavy and travel small distances.
28
Beta particles are lighter and travel further.
29
And gamma radiation is actually a wave, and it travels the farthest of all.
30
The time it takes for half of the radioactive atoms of a radioisotope to decay is called a half -life.
31
Half -lives can range from a fraction of a second to billions of years.
32
Let me give you an example of how half -lives come into play in nuclear medicine.
33
Doctors inject patients with the radioisotope Technetium -99M, which emits gamma radiation.
34
A gamma camera can then take pictures of the patient's insides to help with the diagnosis.
35
The relatively short half -life of six hours for this radioisotope makes it ideal for these types types of tests.
36
Let's pretend these jelly beans are the nuclei of TEC -99M.
37
After one half -life, half the atoms still in the body remain unstable or radioactive.
38
After two half -lives, one quarter of the atoms remain radioactive.
39
After three half -lives, well, you get the idea.
40
After 24 hours, almost all the radioactivity is gone, thanks to radioactive of decay and the body's natural, shall we say, processing?
41
And that ends our science class on radiation.
42
Congratulations, you passed.
43
Now for the bonus question.
44
Can you tell me who keeps an eye on the nuclear sector in Canada?
45
That would be us, the Canadian Nuclear Safety Commission.
46
We regulate the use of nuclear substances and materials and ensure that all nuclear materials are used for peaceful purposes.
47
We also work to protect your health and safety, as well as that of the environment.
48
The Canadian Nuclear Safety Commission.
49
The answers you need from a source you can trust.
50
Visit us at nuclearsafety .gc .ca on YouTube or Facebook.
同頻道
FOR YOU
推薦影片
B12
25 句
What Is An Atom ? | Properties of Matter | Chemistry | FuseSchool
Daily ConversationHigh School Students
B12
7 句
Heat Transfer – In a Minute
Daily ConversationHigh School Students
B12
36 句
Identifying Chemical Properties
Daily ConversationHigh School Students
B11
24 句
Severe Weather
Daily ConversationHigh School StudentsUniversity Students
B23
142 句
Sonic Travels to the Backrooms
TeensDaily ConversationHigh School Students
B194 句
States of Matter | Solid Liquid Gas
Daily ConversationHigh School Students
A21
61 句
What Is Nuclear Fission? | The Power of Splitting Atoms | Amazing Science Facts | Dr. Binocs Show
KidsDaily ConversationHigh School Students
B12
7 句
The Periodic Table Song (2018 Update!) | SCIENCE SONGS
Daily ConversationHigh School StudentsUniversity Students
B166
26 句
What Is the Greenhouse Effect?
Daily ConversationHigh School StudentsUniversity Students
C12
99 句
Endocrine System
Daily ConversationHigh School Students
B11
5 句
What Is DNS?
Daily ConversationWorking Adults
本課的詞彙與口語要點
這段影片共有 50 個句子、628 個單詞可供跟讀。 講話部分時長為 3:55。 說話人語速自然，每分鐘約 160 個詞，接近日常對話。 只有 79% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。
影片中的重點詞彙
影片中 15 個值得學習的單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| atom 名詞 | /ˈætəm/ | 原子 |
| radiation 名詞 | /ˌɹeɪ.diˈeɪ.ʃən/ | 放射, 輻射 /輻射 |
| radioactive 形容詞 | /ˌɹeɪdioʊˈæktɪv/ | 放射性 |
| nucleus 名詞 | /ˈnuː.kli.əs/ | 核心, 核 |
| particle 名詞 | /ˈpɑɹtək(ə)l/ | 粒子 |
| gamma 名詞 | /ˈɡæ.mə/ | 伽瑪 /伽瑪, 伽馬 /伽馬 |
| alpha 名詞 | /ˈæl.fə/ | 阿爾法 /阿爾法, 阿伐 |
| beta 名詞 | /ˈbeɪtə/ | 貝塔 /貝塔 |
| stable 名詞 | /ˈsteɪ.bəl/ | 馬廄, 馬棚 /馬棚 |
| element 名詞 | /ˈɛləmənt/ | 要素 |
| bonus 名詞 | /ˈbəʊ.nəs/ | 額外收獲 /額外收穫 |
| ideal 形容詞 | /aɪˈdi(ə)l/ | 理想的 |
| congratulations | /kənˌɡɹæt͡ʃəˈleɪʃ(ə)nz/ | 恭喜, 恭喜恭喜 |
| exit 名詞 | /ˈɛɡzət/ | 離開 /離開, 退場 /退場 |
| galaxy 名詞 | /ˈɡæl.ək.si/ | 恆星系 /恆星系, 群星 |
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | are known · is made · is called |
| 最高階 the -est / the most … — 一組中最高或最低的 | the largest · the farthest |
需要注意的發音
- “sh” 和 “zh” 音: radiation /ˌɹeɪ.diˈeɪ.ʃən/, congratulations /kənˌɡɹæt͡ʃəˈleɪʃ(ə)nz/, attraction /əˈtɹækʃn̩/, fraction /ˈfɹæk.ʃən/
- 長單詞——注意重音位置: radiation /ˌɹeɪ.diˈeɪ.ʃən/, radioactive /ˌɹeɪdioʊˈæktɪv/, congratulations /kənˌɡɹæt͡ʃəˈleɪʃ(ə)nz/, periodic /ˌpɪɹiˈɑdɪk/, microscopic /ˌmaɪ.kɹəˈskɑ.pɪk/
如何用這段影片練習
- 先完整聽一遍影片，不要開口，記下不認識的單詞。
- 先用 0.75 倍速逐句跟讀，熟練之後再回到正常速度。
- 錄下自己的聲音並與原聲對比，特別注意 atom, radiation, radioactive 這類單詞。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。