有规律的重复活动如声波、光波、无线电波都有一个特定的频率，或者说是每秒的波动次数。

Regular repeating actions such as sound waves, light waves, or radio waves have a certain frequency, or number of waves per second.

《柯林斯英汉双解大词典》

但埃克·森美孚的管理者不断地重复说着他们是长期投资，并不会因暂时的股价波动而动摇。

But Exxon's managers endlessly intoned that they invested for the long term, and would not be moved by temporary swings in prices.

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但多项测试却发现了这种的能力的起伏波动，这些测试在青少年平均年龄14岁时进行，然后在其平均年龄接近18岁时又重复进行。

But tests conducted on teenagers at an average age of 14 and then repeated when their average age was nearly 18 found improvements - and deterioration.

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