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释义：
turn in 提出，返还，睡觉，告密
turn in 表示“提出……”（hand in）或“进入梦乡”，turn into 表示“变成或被换成……”。
例句：
Please turn in your papers by tomorrow.
请你明天把论文交上来。
You didn't even read it before you turned it in?
在你提交之前，连读都没读过？
She went to the police to turn in a client.
她为了告发客户，去找了警察。
I had this room turned into a nursery.
我把这间房改成了托儿所。
对话：
A: Come on everyone. Let's turn in.
大家都过来，我们睡觉啦。
B: But I don't feel sleepy right now.
不过我现在一点都不困啊。
