对于熟悉的信息，你可以说得很快，但对于不熟悉的部分就慢下来了。

You can talk fairly rapidly for information that may be familiar, but then slow down for more unfamiliar sections.

youdao

开始你说得很快，后来可能慢下来。

First you go very fast, and then perhaps you slow up.

youdao

话语说得很快，就如它们根本不该被说。

The words came quickly, as if they were not to be said.

youdao

So I think I can safely say that most people had the right idea and were counting quickly, 3 though I have a feeling that some people who wrote 13 might have forgotten about those 4 f, the 4 f electrons.

我认为我可以放心地说,大部分人的想法都是对的,数得也很快，只是我感觉不少选，13，的人都是因为3,忘了，4，f，4，f，电子。

麻省理工公开课 - 化学原理课程节选