到这时他30岁了。

By this time he was thirty.

《柯林斯英汉双解大词典》

到这时她已经九十多岁了，越来越频繁地需要帮助。

By this time she was in her nineties and needed help more and more frequently.

《柯林斯英汉双解大词典》

youdao

No, we can't. Because if l equals 1, we can not have m sub l equal negative 2, right, because the magnetic quantum number only goes from negative l to positive l here.

不行，因为如果ｌ等于１,ｍｌ的值不可能等于－２，对吧，因为磁量子数的值,这时只能从－１到１

麻省理工公开课 - 化学原理课程节选

You're asked to take a long walk in the park with your parents. And you're just saying,

你还得陪父母到公园里散步。你这时会感慨道，

I like课堂 - SpeakingMax英语口语达人

At this stage I'm at my singleton case.

到这时，我已经得到单一元素情况了。

麻省理工公开课 - 计算机科学及编程导论课程节选