英语语法分析

Well, the return value of toupper so that literally changes this.

好的，toupper的返回值,也就改变了这个。

Invoking the toUpper function is required in order to determine whether or not the tuple satisfies the query.

要确定元组(tuple)是否满足查询，必须调用toupper函数。

The first statement calls a function (in this case, toUpper, which converts a character to uppercase) on each element of a list.

第一个语句在列表的每个元素上调用函数(本例中为toUpper，用于把字符转成大写)。