286、without doubt 毫无疑问;的确
例句：Without doubt, he is the most talented pianist I have ever seen.
毫无疑问，他是我见过的最有天分的钢琴家。
287、dream about / of 梦到……
例句：Last night, I dreamed about flying in the sky.
昨晚，我梦到自己在天上飞。
288、dress sb 给某人穿衣
例句：Could you please help me dress my baby?
你能帮我给我的孩子穿衣吗?
289、dress up 穿上盛装; 乔装打扮
例句：The children dressed up as their favorite characters for the party.
孩子们为了参加派对，打扮成了他们最喜欢的角色。
290、drive away 驱车离开;赶跑
例句：After the argument, he drove away in anger.
争吵之后，他愤怒地驱车离开了。
291、drop by 顺便访问
例句：Feel free to drop by my office anytime.
随时欢迎顺便来我的办公室。
292、drop in 顺便走访
例句：I'll drop in on you later if I have time.
假如我有空闲，我稍后会顺便来看你。
293、drop off 顺便把……送到某处;让……下车
例句：Can you drop me off at the library on your way home?
你回家的路上能顺便送我去图书馆吗?
294、drop out 退学; 辍学
例句：He dropped out of college because of financial difficulties.
他由于经济困难而辍学了。
295、dry up 干涸
例句：The river has dried up due to the lack of rainfall.
因为缺雨，这条河已经干涸了。
296、on duty 值班
例句：Today is my turn to be on duty.
今天轮到我值班。
297、each other 互相;彼此
例句：We helped each other when we were in trouble.
大家遇见麻烦时互相帮助。
298、be all ears 全神贯注地听;洗耳恭听
例句：I'm all ears, tell me everything about your trip.
我洗耳恭听，告诉我你旅游的所有事情。
299、turn a deaf ear 不愿听
例句：He always turns a deaf ear to my advice.
他一直对我的建议充耳不闻。
300、on earth 到底;到底
例句：What on earth are you doing?
你到底在干什么?