If you have other daily routines, such as exercising or talking on the phone with family, work those into your day-to-day life before classes start so that you get a better idea of how they fit in with your schedule.

如果你有其他的日常习惯，如锻炼身体、与家人通电话，你要在开课前将这些习惯融入到日常生活中，这样就能更好地结合这些习惯来进行日程安排。

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You ought to know better than to go swimming on such a cold day.

你应该知道，这样冷的天是不该去游泳的。

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You ought to know better than to go out without an overcoat on such a cold day.

你应当懂得这样冷的天不穿大衣出去可不行。

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In the near-term, that could allow pharmaceutical researchers to better study drug interaction, and one day such tissue might be implanted in a live person, allowing treatment or diagnosis.

ENGADGET: Harvard scientists grow human cells onto nanowire scaffold to form 'cyborg' skin

While Mr. Obama surely does not seek a return to these earlier forms of conflict, a return to first principles such as hostis humani generis may prove a better guide for a nation at war than a president's day-to-day instincts.

WSJ: John Yoo: Obama, Drones and Thomas Aquinas