Subtitles & vocabulary
The shape that changed our world forever
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林宜悉 posted on 2026/04/03Ever wondered why stop signs are red, even though red is hard to see at night? This video dives into the fascinating science behind retroreflection and how it revolutionized traffic signs, making them super visible even in the dark! You'll learn cool vocabulary about light, color perception, and the clever invention that keeps us safe on the road.
Video vocabulary
multiple
US /ˈmʌltəpəl/
・
UK /ˈmʌltɪpl/
- Adjective
- Having or involving more than one of something
- Having or involving several parts, elements, or members.
- Countable Noun
- Number produced by multiplying a smaller number
- A number of identical circuit elements connected in parallel or series.
B1
More basically
US /ˈbesɪkəli,-kli/
・
UK /ˈbeɪsɪkli/
- Adverb
- Used before you explain something simply, clearly
- In essence; when you consider the most important aspects of something.
A2
More variety
US /vəˈraɪɪti/
・
UK /və'raɪətɪ/
- Noun
- Particular type of thing or person
- The quality or state of being different or diverse; the absence of uniformity, sameness, or monotony.
A2TOEIC
More hurdle
US /ˈhɚdl/
・
UK /'hɜ:dl/
- Countable Noun
- Small fence a person or horse jumps over in a race
- Problem that makes it hard to achieve something
- Verb (Transitive/Intransitive)
- To run and jump over something
- To overcome a problem to achieve something
B2
More Use Energy
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