If you had 100 million people properly spread out, then if there's some garbage, you throw it away, preferably where you can't see it, and it will rot.
假设你让一亿的人 适当地分布，然后你有一些垃圾 你将它丢掉，你宁可希望不要看到它，然后它会自行腐烂掉。