这座城市天黑以后便热闹起来。
他们天黑以后才到达边境。
我们天黑以前应该能赶到。
First,they don't meet in the daytime; they meet either early before light,at dawn, or after dark,at night.
首先,他们不在白天聚会;,要么在天亮前的黎明,要么在天黑后的夜晚。
Maybe you should leave before it gets too dark, so that you don't have to walk too far.
也许你该在天黑之前就动身回去了,这样你就不用走那么远了。
The Evening Star is the, roughly speaking, first heavenly body that's visible in the sky as it gets dark, at least at certain times of the year.
粗略说来,昏星就是,天黑时第一个能看见的天体,至少在一年的某个时间段是这样
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