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catch up的意思是：赶上,追上
把…缠住
(1)
抓起(某物),突然拿起(某物)
(2)
打断并挑剔别人的话
(3)
吸住,(被)卷入,受感染
(4)
追上,赶上
（5）
叙旧（口语）
英语句子
The less advanced strive to catch up with the more advanced.
后进赶先进.
Please catch up the loose end of the rope
请抓住绳子松着的一端.
He runs so fast that no one can catch up with him.
他跑得很快没人能赶上他
Liu Na runs so fast that nobody can catch her up.
刘娜跑的那样快,谁也赶不上他
I'll get up at seven o'clock so that I can catch the bus.
我7点钟起床才能赶上公车.
