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).

四. 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句型：

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

五. 成正比，反比

1.be in direct /inverse ratio to/with 与成正比/反比

eg. Male illustrations are in direct ratio to /with the advancement of grades, while female illustrations are in inverse ratio.

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