We were separated by the crowd and I guess we left Stephan behind. Can you give him a call to see where he is?
我们被人群冲散了，可能把Stephan丢在了后面。你能给他打个电话问下他在哪里吗?
Leave sb./sth behind 超越某人，被某人落下
Study harder, or you're gonna be left behind by your classmates.
努力学习，不然就会被同学们落下了。
Leave sb./sth behind 把某物落下了
I left the bag behind at the restaurant. Let's go back for them before they get taken.
我把我的包忘在餐厅了。我们回去拿一下吧，以免别人拿走了。
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