hold one's cards close to one's chest

守口如瓶
- He knew the matter very well, but held his cards close to his chest.
  
  他知道这件事, 但是守口如瓶。
- I don't know why he held his cards close to his chest.
  
  我不知道他为何一直守口如瓶。
- If I tell you the secret, will you hold your cards close to your chest?
  
  如果我告诉你这个秘密, 你能守口如瓶吗?

网络词典

hold one's cards close to one's chest

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Unknown 中文翻译：Unknown

同义词： Unknown

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