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).
稳定
1.…to remain steady/level/unchanged …保持稳定，几乎不变
eg. The rate of …remained steady (fairly level/almost unchanged) during the four years from 1963 to 1967.
2.…to level off (vi.)
eg. After a steady decline for a whole decade, the …rate shows signs of leveling off.
注意：
修饰起伏或稳定状态的副词有：
almost fairly 可以用于表达起伏，稳定状态的句子中的词组或模板：
the general situation was not worsening
show indications of improvement
it can be predicted that…
eg. The rate of …remained steady during the four years from 1963 to 1967,and it can be predicted that the general situation was not worsening.
eg. The rate of …remained steady during the four years from 1963 to 1967,showing signs of improvement in …
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