It's OK for a nurse to be afraid as long as she has a clear head.
护士只要头脑保持清醒，就算觉得害怕也没关系。
A study has found that the middle aged and elderly need just as much as the young if they want to keep a clear head the next day.
研究发现，中老年人和年轻人一样需要充足的睡眠，以使其在第二天保持清醒的头脑。
That might explain their superior physical performance, but how do these troops maintain a clear head with such high levels of noradrenaline swamping their brain?
这就能解释为什么他们拥有超强的体能，但是在如此高水平的去甲肾上腺素下，他们的大脑又是如何保持清醒的呢？
I need to always keep a clear head, because there are so many things to do.
我需要时刻保持清醒的头脑，因为有太多事情需要去做。
It is only during the night when she lies in bed that she feels she has a clear head.
只是晚上躺在床上的时候，她才感到十分清醒。(增加强调句式)。
Middle-aged women must keep a clear head instead of doing things out of willfulness.
人到中年的女性，需要清醒，而不能一厢情愿。
Middle-aged women must keep a clear head instead of doing things out of willfulness.
人到中年的女性，需要清醒，而不能一厢情愿。
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