Is it day or night?

这是白天还是晚上。

youdao

It is never fastened with anything but a latch, either by day or by night.

白天和夜里，它都只上一个活闩。

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It is very likely that broadcasters will send three or four sub-channels during the day and then switch to a single high-quality show that consumes the entire 19.39 Mbps at night.

广播商很可能白天同时传送3到4个节目而晚上利用所有带宽播出高品质的电视节目。

youdao

for everybody, Disc golf is especially popular on college campuses because it's inexpensive and can be played in any season,day or night.

VOA: standard.2010.08.03