◆ traffic/car/road accident 交通事故
■ a lot of 相当于 lots of，它既可以修饰不可数名词，也可以修饰可数名词复数形式。例如：lots of water, a lot of lakes。
把某人留在医院一整夜
keep someone in hospital overnight
A：He didn't go back home last night.
他昨晚没有回家。
B：The doctor kept him in hospital overnight for observation.
医生让他留在医院观察了一整夜。
overnight /???v??na?t/ adv. 整夜地
observation /??bz??ve??n; ?ɑ?bz?r?ve??n/ n. 观察；评论