可以在波浪号前面输入一个数字，表示希望改变多少个字母字符的大小写。

You can enter a numeric character prior to the tilde to denote how many alpha characters you want to change.

youdao

可以使用标记接受用户输入的值并分配一个数字类别ID，在建立blog帖子时需要用这个ID指定类别。

You can use the tag to accept potential values from the user and assign the numerical category ID you need to use when submitting the information when making a blog post.

youdao

您可以对一个输入应用多个排序；每个排序都由确定排序顺序的一个数字来标识。

You can apply multiple sorts to an input; each sort is identified by a numeral that determines the sort order.

youdao

We own our own phone number, that allows you to input key strokes like you would any system and this is an example of what we call CS50 Voice.

我们都有电话号码，这就让我们可以输入任意的数字,然后这是CS50，Voice的一个例子。

哈佛公开课 - 计算机科学课程节选