他的情绪变化不定，一会儿恐惧一会儿生气。

His emotions veered between fear and anger.

《牛津词典》

发型变化不定但长发一直流行。

Hairstyles come and go but long hair is always popular.

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他的心情变化不定，有时激动，有时害怕。

His feelings fluctuated between excitement and fear.

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他的心情变化不定。

His moods change quickly.

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当温度很高且变化不定时，电流的变化规律呈明显的随机性。

When temperature is high and unstable, the current changes with randomness.

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在JDBC2开发的过程中，SQL99还处在一种变化不定的情况下。

During the JDBC 2 development process, SQL99 was still in a state of flux.

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在JDBC2开发的过程中，SQL99还处在一种变化不定的情况下。

During the JDBC 2 development process, SQL99 was still in a state of flux.

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