leave..behind:“不带，留下；忘带了” e.g. a.It's a fine day,so you can leave your raincoat behind. 天气很好，你不用带雨衣。 b.He went off in a hurry and left behind his watch. 他匆匆离开，忘记把手表带上。 leave...behind: “不带，留下；忘带了” e.g. a. It’s a fine day, so you can leave your raincoat behind. 天气很好，你不用带雨衣。 b. He went off in a hurry and left behind his watch. 他匆匆离开，忘记把手表带上