评论
打印
1.Once upon a time, when night-time fell, we were plunged into darkness.
plunge into突然陷入或呈现出
The soldiers plunged into action although they had just marched 20 miles.
士兵们刚跑完20英里的路程, 便立刻投入了战斗。
2.However, cities are using more LED lights because they are cheaper, which is adding to the light pollution.
add to增加，加强
This latest incident will add to the pressure on the government.
最近的这次事件将会给政府增加压力。
