Fall about
捧腹大笑
I fell about laughing when he told me the joke.
当他给我讲这个笑话时，我不禁笑了起来。
Fall apart
精神崩溃；土崩瓦解；破碎
The house is quite old. It might fall apart soon.
这房子很旧。可能很快就会倒塌。
He was almost falling apart. There was a lot of work to do.
他几乎要崩溃了。还有很多工作要做。
They used to be close friends, but fell apart not long ago.
她们曾经是亲密的朋友，但不久前关系破裂了。
Fall away
离开，疏远；消瘦
His friends fell away one by one after his company had gone bankrupt.
他的公司破产后，他的朋友们一个接一个地离开了。
The girl’s face has fallen away after the serious illness.
那场大病之后，她的脸都变消瘦了。
Fall behind
拖欠；落在后面
He didn’t want to fall behind with the rent, but he really didn’t have money.
他不想拖欠房租，但他真的没有钱。
If you don’t study English hard, you may fall behind other students.
如果你不努力学习英语，你可能落后于其他学生。
Fall down
跌倒；失败；倒塌
The old tree fell down in the heavy storm.
那棵老树在暴风雨中倒下了。
He carelessly fell down and broke his leg.
他不小心摔了一跤，摔断了腿。
Fall flat
没有产生预期效果；完全失败
I was surprised that this project didn’t fall flat.
我很惊讶这个项目没有失败。
Though his performance fell flat this time, he didn’t lost heart.
虽然这次他的表演失败了，但他并没有灰心。
Fall for
迷恋；信以为真
Don’t fall for his sweet words.
不要相信他的甜言蜜语。
She was so beautiful that he fell for her at the first glance.
她是如此美丽，他一眼就爱上了她。
Fall in
塌陷；跌入；集合；到期
The roof of the house fell in because of the heavy rain.
由于大雨，房子的屋顶塌了。
Fall in!
集合！
Be careful. Don’t fall in the pond.
小心点。不要掉到池塘里。
When will the contract fall in?
合同什么时候到期?
Fall into
落入；分成; 归入；开始做
The boy fell into the swimming pool.
那个男孩掉进游泳池里了。
The boy fell into conversation with the girl next to him.
那个男孩与他旁边的女孩交谈了起来。
This film falls into the class of comedies.
这部电影属于喜剧类。
Fall in with
同意；赞同
Most of the people fell in with his proposal in the meeting.
在会议上，大多数人同意了他的建议。
Fall off
减少；跌落；下降；离开
The quality of these products has fallen off lately.
这些产品的质量最近下降了。
The output of the factory has fallen off this month.
这个月该厂的产量下降了。
Fall over
跌倒，摔倒；绊了一跤
The naughty boy fell over and twisted his ankle.
那个顽皮的男孩摔倒了，扭伤了脚踝。
Fall back on sth.
借助于；依赖，依靠
He spent all his savings, and had nothing to fall back on.
他把所有的积蓄都花光了，没有什么可依靠的了。
Fall back
退却，后退
Lacking of food, the enemy had to fall back.
由于缺乏食物，敌人不得不撤退。
Fall on/upon
(责任等)落在...; 袭击
My colleague asked for a week’s leave, her work fell on me.
我的同事请了一周假，她的工作落在了我的头上。
The wolf fell upon the sheep hungrily.
狼饥肠辘辘地扑到羊身上。
Fall through
落空；失败
My friend and I were going to travel to Thailand, but our plans fell through because I didn’t get a visa.
我和我的朋友本来打算去泰国旅行，但由于我没有拿到签证，我们的计划落空了。
Fall out
争吵；结果是；证明是； 解散
Fall out!
解散！
It fell out that his decision was totally right.
结果证明他的决定是完全正确的。
She always falls out over money with her husband.
她总是和她的丈夫为钱而争吵。
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