He studied navigation of his own motion.
他是自愿学航海的。
But Frank married Lillian when he was 36, after he had done much of his time-and-motion work and years after he had set up his own engineering consulting business.
但是法兰克和莉莉恩结婚时已经36岁，在那以前他已经进行了大量的时间-动作研究工作，更于早年创办了自己的工程咨询业务。
But Frank married Lillian when he was 36, after he had done much of his time-and-motion work and years after he had set up his own engineering consulting business.
但是法兰克和莉莉恩结婚时已经36岁，在那以前他已经进行了大量的时间-动作研究工作，更于早年创办了自己的工程咨询业务。
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