意气用事;逞性妄为;一时冲动;弄性尚气;
Many people act on impulse without counting the cost.
很多人不考虑后果就莽撞行事。
The outdoor air had apparently taken away from him all tendency to act on impulse.
野外的轻爽天气,显然让他头脑镇静,行动稳定了.
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