Don’t have a cow.
不要大惊小怪
例句：
Don't have a cow! it's just a small bug.
别大惊小怪的，这只是一个小臭虫。
Let The Cat Out Of The Bag
真相大白
例句：
The children put their money together to buy their mother a birthday present, but the youngest child became excited and couldn’t keep from telling his mother what they had bought. His brothers and sisters told him he shouldn’t have let the cat out of the bag.
孩子们把他们的钱凑在一起为他们的妈妈买一个生日礼物，但是最小的那个孩子啊太兴奋了，结果说漏嘴了。他的哥哥姐姐曾经告诉过他不准把这件事说出去。
Take French leave
不辞而别
例句：
I'm sure I saw you at the party last night, but you were nowhere to be foundwhen I wanted to talk to you. Why did you take French leave?
我肯定昨晚在聚会上看到你的，但后来要找你说话的时候却不见人了。你怎么不辞而别啊？
Tips：
Dutch uncle
喋喋不休的教训的人
例句：
Dutch uncle. Try to become a kind person.
不要做一个吹毛求疵的人，试做一个善良的人。
an eye for an eye
以牙还牙
例句：
I hear he has been speaking ill of you. You should make an eye for eye and tooth for tooth revenge.
我听说他一直在讲你坏话，你应该报复他，以眼还眼，以牙还牙。
每天一分钟，进步一点点，相信积累的力量！
Constant dripping wears away a stone.
滴水可以穿石。只要工夫深， 铁杵磨成针。
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