六级必背1、以便：convenient/convenience2、效率：efficient/efficiently/efficiency3、节省和挥霍：save time/money/space; economical, thrift waste time/money/space; costly, lavish4：人旳心理健康：independent, cooperative, competitive, considerate, confident, creative, sociable...

时间:2025-02-26 08:51栏目:高等教育