和他们中的许多人一样，我也曾被忧虑和不满所困扰。

Like many of them, I was once troubled with worries and dissatisfaction.

youdao

煤也曾被用来烧制用本地粘土制造的砖。

The coal was also used to fire bricks made from local clay.

youdao

嫉妒不局限于人类，大象也曾被观察到嫉妒的行为。

Jealousy isn't limited to humankind. Elephants and other.

youdao

In fact, this is an argument that's been made a number of times, and I think there's a lot of sense to it -the last eight lines of Lycidas are written in a very specific line form the Italian scheme of the ottava rima.

这是一个的确曾被无数次提到的观点，并且我也认为这个观点确实有一定道理,利西达斯的最后8行是以一种非常特殊的体裁写的,即意大利式的八行诗。

耶鲁公开课 - 弥尔顿课程节选

Remember the other people, the octaves had been enunciated, the triads had been enunciated.

记住其他人，八度音也曾发明过，三元组也被发现过。

麻省理工公开课 - 固态化学导论课程节选