一个双刃剑英语

aswordwithtwobladesadouble-bladedsword

A double-edged sword或者 你可以说every coin（金币） has its two sides.事物都具有两面性

Adouble-edgedsword或者你可以说everycoin（金币）hasitstwosides.事物都具有两面性

double-edged sworddouble-edged sword[edit] Etymology from the notion that even as one edge of a two-edged sword can be directed at an enemy or otherwise do your bidding, the opposite edge, pointing back as it does towards you, is at risk of doing you harm

a sword with two bad