对于未知的未来状态，很难有坚定的答案。
It's just hard to have robust answers about an unknown future state.
最佳的答案应该是，一天下来，我们的身体已经疲惫了，有必要进行睡眠，以恢复状态。
Probably the best answer is our body is worn out during the day and sleep is necessary to put it back into shape.
在理想状态下，物理对此给出了的一个精确的答案。
Physics gives a precise answer, at least in an ideal setting.
在理想状态下，物理对此给出了的一个精确的答案。
Physics gives a precise answer, at least in an ideal setting.
应用推荐