There was once a large bottle of fresh, clean water. Every drop of water in the bottle felt (骄傲的) of being so clear and pure. Day after day, they would congratulate each other on how clean and (优秀的) they were.
But one day, one of the drops got bored with his clean existence. He wanted to see what it would be like to be a dirty drop. The other drops tried to talk him out of the idea, but (失败).
When the drop came back all dirty, he (转变) all the other drops in the bottle into dirty drops, too. They tried to get clean again, but couldn't . Several (月) later, someone put the bottle in a pool. A lot of clean water entered the large bottle, and the drops finally made (他们自己) pure again.
Now the drops reach an (同意) that if they want to be clean, then each one of them will have to stay clean. Correcting the mistake of (甚至) one single drop requires a lot of hard work.
To some degree, this bottle of water is just like the Earth. If we want to live on a clean planet , each one of us will have to be a "clean drop. " (无论何时) someone or some country becomes a "dirty drop" and pollutes the air or the ocean, the whole Earth becomes a bit dirtier. It will be very difficult, perhaps impossible, to make this "bottle of water" clean again.
The same may also happen to you and your class (or school). If you want your class (or school) to be among the best, then each of you will need to (表现) well. Are you a "clean drop"?
