The days are long and the nights are short请问在这days和nights为什么要加S

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Thedaysarelongandthenightsareshort请问在这days和nights为什么要加SThedaysarelongandthenightsareshort请问在这days和ni

The days are long and the nights are short请问在这days和nights为什么要加S
The days are long and the nights are short
请问在这days和nights为什么要加S

The days are long and the nights are short请问在这days和nights为什么要加S
句子的意思是:白天的时间长,晚上的时间短.所以days和nights指的是所有的day和night.比如,The roses are red.同样的道理,明白?

因为它们是可数名词