they are 的缩写是they're。
they are解释：他们是。
they解释：
读音：（英 [ðeɪ] ， 美 [ðe] ）
pron：她们，他/她/它们， 人们，大家，政府，当局。
例句：They is a third person plural pronoun。
They is used as the subject of a verb。
they是第三人称复数代词，作动词的主语。
are解释：
读音：（英 [ɑ:(r)] ， 美 [ɑ:r] ）
vi：（用于第二人称单复数现在时，第一、三人称复数现在时）是。
n：公亩（等于100平方米）。
现在分词： being ，过去式： were ，过去分词： been。
例句（be的复数和第二人称单数现在时形式，口语中在代词后常略作they're）：
Are is the plural and the second person singular of the present tense of the verb be 。
Are is often shortened to they're after pronouns in spoken English。
双语例句（拓展）：
They are about to start。
他们快要出发了。
They are all my seniors。
他们都是我的前辈。
I will say no more on these matters, important though they are。
虽然这些事很重要，我也不想再说什么了。
You can find out whether they are prepared to share the cost of the flowers with
you。
你可以弄清楚他们是否愿意和你一起分担买花的费用。
They are controlling so much cocoa that they are virtually monopolizing the
market。
他们控制了大量的可可粉，因此他们几乎垄断了整个市场。
My impression is that they are totally out of control。
我的感觉是它们完全失去了控制。
You're saying they are sending too many people to prison?
你是说他们把太多人关进了监狱？
They are on good terms again。
他们和好了。
They are best qualified to speak on this question。
他们对这个问题最有发言权。
They are already familiar faces on our TV screens。
他们已经是我们电视屏幕上的熟面孔了。