夜间目测及信号导航等级则要求仅用仪表装置来证明你导航的能力。
Night VFR and command instrument ratings (CIR) require you to prove your ability to navigate by instruments only.
如果夜间气温下降是一个信号，提醒我们的身体入睡的理想时间到了，那么，这说不定就是工业化社会中慢性失眠如此普遍的原因之一。
If falling temperatures at night are a signal to our bodies that it is an ideal time to go to sleep, then that could be one reason chronic insomnia is so prevalent in industrialized societies.
本系统可安装在汽车上，用于雾天或夜间监测前方车辆，并在车速、车距达到临界安全值时发出报警信号，以避免交通事故的发生，确保行车安全。
It can give alarming signal when the speed of vehicle and the distance between vehicles reach the edge of security, so more traffic accidents can be avoided.
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