they are

基本解释

They are classified in sorts.
它们是按品种分类的。
《新英汉大辞典》
They are the backbone of the factory.
他们是这个厂的顶梁柱。
《新英汉大辞典》
They are friends rivaling with each other in technological design.
他们在工艺设计方面是互相竞争的朋友。

They look like they are sleeping. The suggestions they receive may be able to direct their whole mental energy against pain.
There they are. And, when they are named, they are named by suggestion by the scientist who have isolated them.
它们在这，当它们被起名的时候，是由科学家们建议的,那些提取它们的科学家。
麻省理工公开课 - 固态化学导论课程节选
And hole in the walls that people don't even know about, and they are just like, they line the streets.
那儿有人们都不知道的小店铺，它们就像，排列在大街上一样。
关于SOHO - SpeakingMax英语口语达人

They are leaving the sectarian conflict to the Iraqi police and focusing on the insurgency.
NPR: Sectarian Killings Divide Integrated Baghdad Suburb