The number of fatal U. s. military helicopter crashes in Iraq has spiked in recent weeks, fitting a wartime pattern of more frequent accidental and combat crashes during winter months.
在伊美直升机最近几星期出事不少，可能是出动太频繁导至和冬季的不利气候。
The number of fatal U. s. military helicopter crashes in Iraq has spiked in recent weeks, fitting a wartime pattern of more frequent accidental and combat crashes during winter months.
在伊美直升机最近几星期出事不少，可能是出动太频繁导至和冬季的不利气候。
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