Preemptivestrikes are okay when you know for sure what you're preempting.
当你确信你所占的先机，先发制人未尝不可。
2
Marketers tend to launch ambush campaigns only once an event has started, making preemptivestrikes almost impossible.
市场营销员往往只要赛事一开始就开展“伏击活动”，这使得提前制止它成为几乎不可能的事情。
3
It has made similar statements for years threatening preemptivestrikes, but those have almost always been in response to joint South Korean-U. S. military drills.