当机立断

遇到危险要当机立断

yùdào wēixiǎn yào dāngjī-lìduàn

In the face of danger, one must make an immediate decision

他当机立断换了方案

tā dāngjī-lìduàn huàn le fāng'àn

He changed plans without hesitation when critical

关键时刻她很会当机立断

guānjiàn shíkè tā hěn huì dāngjī-lìduàn

In key moments, she knows how to make quick decisions