Zero means none or nothing. 零表示没有。

　　If you say you have zero sisters, you mean you have no sisters at all. 如果你说你有零个姐妹，意思是你根本没有姐妹。

　　In math, zero is written by the number 0, and it is before +1. 在数学上，零写作数字0，在正数1之前。

　　People wrote zero for the first time in the 13th century. 人们从13世纪开始使用零。

　　It became more and more necessary in math, science, business and so on. 零在数学、科学、商业等领域中变得越来越必要。

　　Is it zero a number? Yes, it is. 零是数字吗？当然是。