大学英语：重要词汇in general(=in most cases，usually)通常

339.catch(or get)a glimpse of瞥见(强调结果);take a glance(or look)at看一眼(强调动作)

340.be good for 对…有好处;对…有作用;be good at 擅长于;be good to 对…好

341.in good time(=early)早早地(做完.到达等)

342.for good(=forever)永远地，长期地

343.take…for granted(=assume to be true)把…认为理所当然的.

344.be grateful to sb. for sth. 因…感谢某人

345.on the ground(s)for(=because of)由于…

346.fall to the ground(计划、希望等)失败，落空

347.on one's guard(against)谨防，警惕;(be)on guard站岗

348.guard against(=defend，keep safe)警惕，防止;guard…against 警卫…防止