把手伸进去看看水有多热。

Dip your hand in to see how hot the water is.

《牛津词典》

她从不在乎天气有多热。

She never minded how hot it was.

《牛津词典》

它有多热？

How hot is it?

youdao

You do it so quickly that the heat flow between the inside of the bicycle pump and the outside is too slow compared to the speed at which you compress.

我们用力很大,于是压缩得很快,打气筒内外热传递的速度,与之相比要慢得多。

麻省理工公开课 - 热力学与动力学课程节选