我是今天的值日生，今天我给大家介绍一篇短文，希望能给大家带来一些知识和乐趣。

Good morning, you guys. I'm on duty today. I'd like to share an article with you, and hope it will be amusing and of help to you.

youdao

我是今天的值日生，今天我给大家介绍一篇短文，希望能给大家带来一些知识和乐趣。

Good morning, you guys. I'm on duty today. I'd like to share an article with you, and hope it will be amusing and of help to you.

youdao