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第一段词汇解析
①make an attempt to do sth., 努力去做某事,类似的有 leave no stone unturned to
do sth.(不留余力做某事)。
②forced to land = obliged to come down。
③picked up = rescued。
第二段词汇解析
①completed = finished, undertaken。
②covered = completed(侧重于完成), flown。
③overland, 陆上的,类似的 overnight, overseas, oversleep, overwork 等。 test = trial。
④set off = started out, began his journey。
⑤failed = didn't work, stopped。