have quick wits [have a ready wit] in an emergency;A good [a clever;an excellent] idea occurred to one's mind at the crucial moment.;have a brainwave when in danger ;

Fortunately somebody had the presence of mind to turn off the water at the main.
幸好有人急中生智切断了总水管.
来源:网络文摘精选But the very imminence of the emergency paralyzed his invention . Good!
常言说得好,急中生智,可汤姆这回却束手无策,对,就这么办.
来源:英汉文学 - 汤姆历险With great presence of mind a fireman pulled the driver away from the burning cab.
一位消防员急中生智,将司机从燃烧的车里拉出来.
来源:网络文摘精选
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