... signal for day and night 昼夜通用信号 Signal day light 灯光式号志 day signal 昼间信号 ; 日间信号 ...
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This is great news for those of us who like to nap during the day, and is a signal to all of us that staying up all night to revise probably isn't a good idea.
这对于喜欢白天打盹的人而言是个好消息，也是对所有人的一个警示：晚上熬夜复习恐怕不是个好主意。
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