Studies show that a man's brain measures speed and distance to know when to change direction.
研究表明，男性大脑通过估量速度和距离来知道什么时候转变方向。
It's up to you to carve out your place, to know when to change course, and to keep yourself engaged and productive during a work life that may span some 50 years.
在未来可能长达50年的职业生涯里，如何规划自己的工作，知道什么时候改变工作方向，如何让自己更投入更有效率，这些都完全取决你自己。
Some are not instructed in when to change the filters on their safety masks.
很多人都没有被告知什么时候更换安全面罩的过滤网。
Some are not instructed in when to change the filters on their safety masks.
很多人都没有被告知什么时候更换安全面罩的过滤网。
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