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)。
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)。
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