先发制人[xiān fā zhì rén]
词典strike first to gain the initiative：先发制人。
词典beat to the draw：抢在…之前；先发制人。
词典dominate the enemy by striking first：先发制人。
词典fire the first shot：先发制人；打头炮。
词典get the drop on sb.：先发制人，胜过某人。
先发制人[xiān fā zhì rén]
strike first to gain the initiative; beat to the draw; dominate the enemy by striking first; fire the first shot; gain an advantage over a competitor [the enemy] without his knowing; gain mastery by striking first; get [have] the drop on sb.; get the upper
例：采取先发制人的手段
take preemptive measures;
如受威胁便发动先发制人的打击
launch a preemptive strike if threatened