shù / xué / kè / shàng / lǎo / shī / yòng / sān / yī / sān / shí / yī / lái / shuō / míng / sān / fēn / zhī / yī / de / xiǎo / shù / xiě / fǎ

数学课上，老师用“三一三十一”来说明三分之一的小数写法。

In math class, the teacher used “sān yī sān shí yī” to explain how to write one-third as a decimal.