毕竟，为守候第一个孩子降落人世，他离开赛场6个星期，他的状态，随着孩子的降临而峰起谷落。不无奇怪，不稳定的情绪带进了赛场，打乱了他的开局。

After a six-week break from the sport while awaiting the birth of his first child, his form here had, not surprisingly, been up and down and it was so again here in the opening set.

youdao

戴维的母亲情绪不稳定，喜怒无常。

David's mother was unstable and moody.

《柯林斯英汉双解大词典》

同样你也知道你们的情绪是可以多么的不稳定，它们也不是真理的标准。

And you also know how unstable your emotions can be and that they are not a measure of truth either.

youdao

the teacher is not completely calm when he or she takes the action.

老师在动武的时候情绪不完全地稳定。

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