1.Once upon a time, when night-time fell, we were plunged into darkness.
plunge into突然陷入或呈現(xiàn)出
The soldiers plunged into action although they had just marched 20 miles.
士兵們剛跑完20英里的路程, 便立刻投入了戰(zhàn)斗 。
2.However, cities are using more LED lights because they are cheaper, which is adding to the light pollution.
add to增加,加強(qiáng)
This latest incident will add to the pressure on the government.
最近的這次事件將會(huì)給政府增加壓力 。