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The Marine Corps' Development of Aerial Delivery in Nicaragua Between 1912 and 1933

机译：尼加拉瓜海军陆战队1912年至1933年间空中运输的发展

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The U.S. Marine Corps sergeant paused for a moment and, wiping the sweat from his face with his free hand, strained to hear the sound of the aircraft. The point man, noticing the sergeant had stopped, also stopped and remained motionless with his weapon pointed in the direction they were headed. The rest of the squad drew to a halt behind the sergeant and immediately took up positions facing left and right with their rifles pointed outward. Unfortunately, the thick jungle canopy muffled the sound of the airplane's engine and made it hard to locate its origin. The sergeant knew he was on the correct compass heading, but judging the distance they had traveled through the heavy underbrush was difficult, even for an old hand like him.
机译：美国海军陆战队中士停了片刻，用他的空手擦了擦脸上的汗水，紧张地听着飞机的声音。指示军人注意到中士已经停下，也停了下来，一动不动，武器指向他们的前进方向。其余的小队在中士身后停下了下来，立即以步枪朝外的姿势面对了左右。不幸的是，茂密的丛林冠层掩盖了飞机引擎的声音，使飞机难以找到原点。中士知道他正朝着正确的指南针方向行驶，但是即使对于像他这样的老手，也很难判断他们穿过沉重的灌木丛的距离。

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