几英里的游泳、数英里的跑步，湿沙中的滚打，一遍又一遍反反复复地考验着这些准海豹队员的体力与毅力。
Prospective SEALs are made to repeat multiple cycles of swimming several miles, running several miles, and rolling through sand.
几英里的游泳、数英里的跑步，湿沙中的滚打，一遍又一遍反反复复地考验着这些准海豹队员的体力与毅力。
Prospective SEALs are made to repeat multiple cycles of swimming several miles, running several miles, and rolling through sand.
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