例句：The child sat on its mother' s lap, listening to an interestingstory.
小孩坐在妈妈的膝上，听一个有趣的故事。
lag n. 落后，迟延vi. 缓缓而行，滞后vt. 落后于
例句：You will lag behind unless you study harder.
你如不更加努力地学习就要掉队。
overlap v. (与……)交叠，重合
例句：How many times a day does a clock' s hands overlap?
时钟的指针一天内会重合几次?
clap n. 拍手声，霹雳声v. 鼓掌，轻拍
例句：Carmen gave me a clap on the back and invited me for a drink.
卡门在我背上拍了一下，请我去喝酒。
collapse n. 倒塌，崩溃，失败vi. 倒塌，精费，瓦解，失败
例句：Having been deserted for years, the house collapsed.
这所房子因废弃太久而倒塌了。
elapse n. (时间)过去，消逝v. 流逝
例句：Many years were to elapse before I saw my best friend in childhoodagain.
我再次见到儿时好友，已经过去多年了。
flap n. 拍打，拍打声，副翼v. 拍打，飘动，扔，掷
例句：A flap from the tail of the huge whale upset the boat.
巨大的鲸鱼的尾巴轻轻拍打便把小船打翻了。
slap vt. 拍，打，掌击，拍击n. 拍，掌击，拍击
例句：He gave Denny a slap on the cheek and Denny began to cry.
他打了丹尼一耳光，丹尼就哭起来了。
