hints:

最后的人名不用寫

How many times have we walked past a piece of litter on the ground, cursing whoever was so thoughtless as to drop it and wondering when someone would come by to clean it up? It wouldn't be hard for us to bend over and pick up the litter, then drop it in the nearest waste bin, after all.
我們曾有多少次走路時看到地上有垃圾時咒罵是誰這么粗心掉下了它，又在想到底什么時候會有人過來清理它。但是畢竟彎腰把它撿起來扔到垃圾桶里也不是什么難事。