they后面加are。因为they是复数。they are的例句：They are an established company with a good reputation（他们是一家地位稳固、信誉良好的公司）。

they are的例句：They are at the end of their food supply（他们的食物储备已消耗殆尽）；They are one of this year's hot new bands（他们是今年走红的新乐队之一）。