到目前为止，美国这个月至少在巴基斯坦进行了25次无人机袭击，这是过去六年中，发动袭击次数最高的月份，美国媒体报道。
The US has carried out at least 25 drone strikes so farthis month in Pakistan's tribal areas - the highest monthly total for the pastsix years, US media reported.
这样说来，两冲程发动机的点火次数是四冲程发动机的两倍。
Thus, a two-cycle engine fires twice as often as a four-cycle engine.
发动快攻次数少。
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