第一，迷你对话

　　A: Oh, my God. I have forgotten what I need to buy.

　　哦，天啊，我忘记我需要买的东西了。

　　B: Do not worry. Just be as cool as a cucumber.

　　别急，镇定点。

　　第二，核心短语

　　as cool as a cucumber

　　1. 解词释义

　　To be as cool as a cucumber的字面意思是“像黄瓜一样凉爽”， 比喻为“镇定，冷静，泰然自若”的意思。表示一个遇到麻烦时很冷静，很镇定，很放松。Cool在这里的意思不是“凉爽”，是“冷静的”的意思。使用时，表示对.....表现得冷静，在短语后面用上介词upon，即:be as cool as a cucumber upon something。

　　2. 拓展例句

　　e.g. It's not everybody who can keep as cool as a cucumber in an emergency.

　　并不是人人都能在危急时刻保持镇定自若的。

　　e.g. He is as cool as a cucumber upon every act of atrocity.

　　他面对一切暴行都表现得冷静沉着。

　　e.g. He kept as cool as a cucumber as the newspaper reporters shouted questions at him at once.

　　在报社记者七嘴八舌地高声向他提问时,他始终表现得镇定自若。