跟不上趟儿cannot: cannot =can not. catch: vt. (caught; caught) 1.捕捉;逮着 ...up: adv. (superl. uppermost ) 1. ...rank: adj. 1.繁茂的,蔓延的;过于肥沃的。 2.臭极的, ...cannot catch up with one: 跟不上功课下载手机词典可随时随地查词查翻译