Definition: used to say that it is becoming dark Level: C2
随着夜幕降临，城市灯光开始闪烁。
As ___darkness ___fell, the city lights started to twinkle.
夜幕降临时，我们决定扎营过夜。
As ___darkness ___fell, we decided to set up camp for the night.
当夜晚降临时，沙漠中的温度显著下降。
When ___night ___falls, the temperature drops significantly in the desert.
