The rain was so heavy that I had to turn on the windscreen wipers.

windscreen 是复合词，由 wind（风）和 screen（屏幕、屏障）组成，字面意思是"挡风的屏障"，指汽车前部用来阻挡风雨的玻璃，即"挡风玻璃"。 windscreen wipers 指安装在挡风玻璃上用来清除雨水的装置，即"挡风玻璃雨刷器"。