He often loses his temper for nothing.

他常常无缘无故地使性子。

《新英汉大辞典》

I always lose my temper for no reason.

我经常莫名其妙地发脾气。

youdao

It says a lot for her that she never lost her temper.

她从没发过脾气，这说明她很有涵养。

《牛津词典》

Her temper overwrought me, ] And I edged to shun her view For I felt assured she thought me One who should drown him too.

她的性情，诗人接着说，让我紧张烦恼，我慢慢的避开她的观点，离开月光,因为我断言，她认为我,应该也会溺死他。

耶鲁公开课 - 现代诗歌课程节选

Indeed, primary-market overdrive this week is leading many participants to temper expectations for May issuance volume after many issuers were determined to have pulled funding plans forward to exploit the all-time lows in borrowing costs.

FORBES: HG Bond Issuance Surges as Rates Sink, Market Beckons

So long after the social firestorms have faded away, the unanswered questions about the affected brands will lurk, subtly influencing stakeholder decisions as they await evident reactivation by the next crisis (or temper enthusiasm for a positive news bit).

FORBES: Social Media Are More Interested in Your Supply Chain Than Your Marketing

So the government needs to temper its enthusiasm for universal child care and working mothers.

ECONOMIST: British social policy