“它们当然是在飞！”班里的一个小女孩回答说，“它们叫蝴蝶（butterflies）。如果它们不飞（fly），就只能是黄油（butter）！”

"Of course they're flying!" a little girl in a class replied."They're called butterflies. If they didn't fly, they'd just be butter!"

youdao

我们不飞东京。

We don't fly to Tokyo.

youdao

长时间不飞：只是适合12秒。

It did not fly for very long: only for 12 seconds.

youdao

That doesn't happen in flight, but it happens during takeoff.

飞到天上之后就不这样了,但起飞的时候确实会这样

耶鲁公开课 - 基础物理课程节选