1、down是一个副词意思是在下面、向下、朝下。
2、The sun is going down and it'll be dark soon.太阳要落下去了，天很快就要黑了。
3、Why don't you lie down on the sofa for a while?你为什么不在沙发上躺一会儿呢？
4、I'll write it down now so i won't forget.我现在就要写下来，以免忘记了。
5、write down写下，cut down削减，lie down躺下，put down制止。
