keep them to themselves 是保守秘密，不交际；杜门不出；落落寡交的意思。
keep ‥to oneself保守秘密
例句
If people have problems,they should try to keep them to themselves.如果人们有问题,他们应该尝试自己解决。
Don't keep the news to
yourself；let's all share it．不要只管自己知道这消息，让我们也知道吧。
I'll tell you only if you promise
to keep it to yourself．你答应保守秘密，我才告诉你。
I can't understand why you kept the
news to yourself for so long．我不明白你为什么这么长时间也不把消息告诉他人。
让他们自己
就按他们说的办
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