保密（习语）
your hat───你的帽子
keep your───保持你的
under my hat───在我的帽子下面
keep under control───控制（监视等）；压；把持；律
keep it───坚持
doff your hat───脱下你的帽子
keep your eye───注意点
keep your cool───保持冷静（唱片名，KeepYourCool）
keep your heart───保持你的心
I don't want him to know, so keep it under your hat.───我不要他知道，所以要保守秘密。
Look, if I tell you something, will you promise to keep it under your hat?───喂，如果我告诉你什么事情，你能答应保守秘密吗？
You must promise to keep it under your hat.───你必须保证要保守秘密。
Everyone knows there are many English expressions about clothes. There is no need to keep it a secret, or keep it under your hat.───每个人都知道有许多跟衣服有关的英文表达，这并不需要作为秘密来保守。
There is no need to keep it a secret, or keep it under your hat.───有没有必要保持它的秘密，或保持在你的帽子。
She told me not to tell anybody else, so keep it under your hat.───她要我不要跟任何人说，你要保密啊。
I've got some interesting news, but you must promise to keep it under your hat for the moment.───我知道些特有意思的事儿，但是你必须保证先别告诉别人。
Everyone knows there are many English expressions about clothes. There is no need to keep it under your hat.───每个人都知道Clothes有许多的英文表述，这并不需要保密。
I hear that John and Mary are getting a divorce, but keep it under your hat.
Rather than wear your heart on your sleeve, you keep it under your hat.
Keep it under your hat.