have a card up one's sleeve 心中有數
【講解】
card指“卡片”；sleeve指“衣袖”。該習語直譯為“有一張卡片藏在某人的袖子里面”，指某人做某事“心中有數，胸有成竹”。
【對話】
A:Do you think Tom can remain at the top of the class this time?
A:你認為湯姆這次還能保特全班第一嗎？
B:I believe so. He seems to have a card up his sleeve.
B:我相信他能。他看起來胸有成竹。
A:All his confidence comes from hardworking.
A:他的自信源于他的勤奮。
B:Yeah. he's the most diligent student I have ever met.
B：是啊，他是我見過的最勤奮的學生了。
【講解】
card指“卡片”；sleeve指“衣袖”。該習語直譯為“有一張卡片藏在某人的袖子里面”，指某人做某事“心中有數，胸有成竹”。
【對話】
A:Do you think Tom can remain at the top of the class this time?
A:你認為湯姆這次還能保特全班第一嗎？
B:I believe so. He seems to have a card up his sleeve.
B:我相信他能。他看起來胸有成竹。
A:All his confidence comes from hardworking.
A:他的自信源于他的勤奮。
B:Yeah. he's the most diligent student I have ever met.
B：是啊，他是我見過的最勤奮的學生了。