它们是偶数位的数字，可以被平分为两个所谓的尖牙，这些尖牙是这个数的因子，包含原始数的所有数字。

They are Numbers with an even number of digits that can be equally divided into two so-called fangs. These fangs are factors of the number and contain all of the digits of the original number.

youdao

用其他的话来讲，展开形式是一种方式，把数给分开，并且将它作为一个各数字（是单独的数位上的数字）值的和来表达它。

In other words, expanded form is the method of pulling a number apart and expressing it as a sum of the values of each digit.

youdao

这里有个例子，数据透视表显示服务器上设计的数字格式——在本例中，为带两位小数位数的美元。

Here is an example of a PivotTable displaying number formatting as defined on the server - in this case dollars with two decimals.

youdao

So unlike an int, this is the type of number that can have numbers after a decimal place.

所以，不同于int，这个类型的数字,可以有小数位。

哈佛公开课 - 计算机科学课程节选