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1. catch at 抓住，采納。如：A drowning man will catch a straw. 快淹死的人一根稻草也要抓。They caught at the idea. 他們采納了這個(gè)意見(jiàn)。
2. catch on (1) 掛住，鉤住。如：Her coat caught on the nail. 她的大衣給釘子鉤住了。(2) 受歡迎，流行。如：The new song caught on quickly. 那首歌很快就流行開(kāi)來(lái)。(3) 領(lǐng)會(huì )，理解，懂得。如：He is very quick (slow) to catch on. 他理解得很快(慢)。I don’t quite catch on to what he is saying. 我不大理解他在講什么。
3. catch sb doing sth 發(fā)現(撞見(jiàn)，逮住)某人正在做某事。如：The teacher caught him sleeping in class. 老師發(fā)現他在上課時(shí)睡覺(jué)。We caught him (in the act of) stealing. 他正在行竊被我們逮個(gè)正著(zhù)。
4. catch sb out發(fā)現某人有錯。如：Ask me anything you like --- you won’t catch me out. 你盡管問(wèn)吧，決問(wèn)不倒我。
5. catch up 趕上，追上。如：If you miss a lot of lessons, it’s very difficult to catch up. 要是你耽誤很多課，你會(huì )很難上趕上的。Will we catch up with Japan industrial production? 我們能在工業(yè)生產(chǎn)上趕上日本嗎? 注：catch sb up ?？膳c catch up with sb 互換。如：You go ahead and I RGIN-TOP: 0cm; MARGIN-BOTTOM: 0pt; TEXT-INDENT: 21will catch you up [catch up with you]later. 我一會(huì )兒就會(huì )趕上你的。
6. catch up on (doing) sth 趕做，彌補。如：I’ve a lot of work to catch up on. 我有很多工作要趕做。I have to catch up on writing letters tonight so I can’t go out. 今晚我要趕寫(xiě)幾封信，所以不能出去。