看看为什么你不需要担心遇到E.T .(暂无法链接)。

See why you don't have to worry about meeting e.t..

youdao

看看为什么你不需要担心遇到E.T。(暂无法链接)。

See why you don't have to worry about meeting E. t.

youdao

为什么浪费钱买你不需要的衣服呢？

Why waste money on clothes you don't need?

《牛津词典》

We'll think about it in section, how you don't need to vaccinate everybody, but you just need to vaccinate a critical number in order to stop the disease from progressing through a community.

我们在讨论会上讲这个,为什么不需要给每个人都接种,但你只需要让接种人数达到一个临界值,就能阻止这个疾病在社会中传播

耶鲁公开课 - 生物医学工程探索课程节选