In negotiations, it's wise to keep your cards close to your chest until you know the other side's bottom line.

在谈判中，直到你了解对方的底线之前，保持秘密更明智。

She tends to keep her cards close to her chest, even with friends, so you never know what she's thinking.

她即便和朋友在一起，也总是把话藏在心里，所以你永远猜不到她在想什么。

If you want to land the job, you shouldn't reveal your strategy—keep your cards close to your chest.

如果你想拿下这份工作，就不应该暴露你的策略——保持低调，不轻易透露。

During the project, our team kept our cards close to our chests to avoid tipping off the competitors.

在这个项目期间，为了避免让竞争对手察觉，我们团队都把牌藏在胸口。

He didn't tell anyone about his new business idea; he kept his cards close to his chest.

他没有告诉任何人他的新商业点子，一直把计划藏在心里。