指甲上的甲油保持多长时间呢？
记录保持多长时间？
倘若保持低调不被发现(如果在一个大城市附近)更好，那么不被人发现必须持续多长时间？
If it is better to keep a low profile, and not be seen (if you are near a big city), how long should you have to remain out of sight?
在生理方面，睡眠多长时间以使你保持敏捷？
On the physical side, how much sleep should I get to be sharp?
在生理方面，睡眠多长时间以使你保持敏捷？
On the physical side, how much sleep should I get to be sharp?
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