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三. 起伏
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).
【手機(jī)用戶】→點(diǎn)擊進(jìn)入免費(fèi)試聽>>【CET4】 * 【CET6】
【電腦用戶】→點(diǎn)擊進(jìn)入免費(fèi)試聽>>四六級(jí)考試課程！
三. 起伏
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).