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have a card up one's sleeve 心中有数
【讲解】
card指“卡片”；sleeve指“衣袖”。该习语直译为“有一张卡片藏在某人的袖子里面”，指某人做某事“心中有数，胸有成竹”。
【对话】
A:Do you think Tom can remain at the top of the class this time?
A:你认为汤姆这次还能保特全班第一吗？
B:I believe so. He seems to have a card up his sleeve.
B:我相信他能。他看起来胸有成竹。
A:All his confidence comes from hardworking.
A:他的自信源于他的勤奋。
B:Yeah. he's the most diligent student I have ever met.
B：是啊，他是我见过的最勤奋的学生了。
