做点刺绣，玩个字谜、数独游戏、复局桥牌之类的，保持大脑和身体的活动状态。
I keep my brain and body active with needlework, crosswords, Sudokus or duplicate bridge.
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.
利用与每个四元数矩阵相关联的复伴随矩阵，问题被简化为关于复数矩阵的并行问题。
The problem is reduced to a parallel one on complex matrices by using the complex adjoint matrix related to each quaternion matrix.
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