题目

Once there was no zero.
Once there was no zero(零).To write the number sixty-three,people wrote 63.To write six hundred and three,people wrote 6 3.The space was there to mean “not any” tens.Sometimes people did not remember the space.It was hard to see and to read.
Later people used a dot(点) to hold the space.Six hundred and three looked like this 6·3.But the dot was hard to see.So people put a circle around it like this 6⊙3.Then people could see the dot.They remembered the space.
At last,only the circle around the dot was used.It was like a zero.This is one story of how the zero came to be used.
Now zero has many important uses.Zero tells how many.Can you tell some other ways zero is used?翻译

提问时间：2020-05-21

答案

起初是没有零的.如果要表示数字六十三,人们都写成63,要写六百零三时又会写成6 3.中间的空白表示“什么都没有”.但是有时候人们不记得这段空白,因为太难辨认了.后来人们用一点来填充这段空白,于是六百零三就写成了6·...