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350. by guess 靠猜

349. guess at 猜, 估計(jì)

348. guard against (=defend, keep safe)警惕,防止 guard…against 警衛(wèi)…防止

347. on one’s guard(against) 謹(jǐn)防, 警惕 (be) on guard 站崗

346. fall to the ground (計(jì)劃.希望等)失敗,落空

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

344. be grateful to sb. for sth 因…感謝某人

343. take…for granted (=assume to be true)把…認(rèn)為理所當(dāng)然的.

342. for good (=for ever) 永遠(yuǎn)地, 長期地

341. in good time(=early)早早地(做完.到達(dá)等)