然后她继续说：“我有一个选择。”

Then she continued, "I have a choice."

youdao

我有一个选择了自由女神像。

I have a selected the statue of Liberty.

youdao

如果我有一个选择的机会，我宁愿不在这个学校继续我的学业。

If I have a choice, I had sooner not continue my studies at this school.

youdao

So let's do a quick clicker question, and you tell me how many valence electrons does fluorine have? Remember, valence electrons are different from core, they're only the outer-most electrons in the outer-most shell.

那么让我们来做一个小选择题，请大家来告诉我,氟有多少个价电子，要记得，价电子与芯电子不同，它们是在最外壳层的最靠外面的电子。

麻省理工公开课 - 化学原理课程节选