a. 双刃的
在线英汉词典

two-edged的短语、例句：

two-edged adj (a) (of a knife, sword, etc) having two cutting-edges （指刀、 剑等）双刃的, 双锋的. (b) (fig 比喻) having two possible (and contradictory) meanings or effects at the same time 有双重（矛盾的）含义或作用的
a ,two-edged remark 一语双关的话
Publicity is a ,two-edged `weapon. 出了名有利也有弊.