士兵们连续的行军，作战，他们又累又热又脏。
The soldiers had been marching and fighting, they were dirty, hot and tired.
在一个美军无法展开地面作战的国家使用无人驾驶飞行器进行军事打击，这激起了关于合法性、效率，和道德的激烈争论。
The use of unmanned aerial vehicles in a country where U.S. forces are not able to conduct ground operations has stirred heated debates over the legality, effectiveness, and morality of these strikes.
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