2018年12月英语六级作文万能句模板：表起伏

英语自学网

　　1.…to go up and down …起伏不定
        　　eg. The strike rate went up and down during the period from 1952 to
1967.
        　　2.There be ups and downs …有起有伏
        　　eg. Between 1972 and 1979, there were several ups and downs in (某方面).