Now, when you look at the water that comes off of your roof and runs off of your lawn and flows down the gutter, you might say to yourself, "Do I really want to drink that stuff?"
当你看到雨水从房顶滴落， 漫过草坪，流进沟渠， 你可能会犹豫，“我真的要喝这样的水吗？”