中科新闻网空调使用温度规定:短文翻译
来源：百度文库 编辑：中科新闻网 时间：2024/05/03 08:51:03
Take any long piece of paper. Now glue the ends of the paper together. You have made a ring. Take a second long of paper, twist the paper once and goue the ends together. Now you have made a Mobius band . For people studying math,this band is uncommon.