A one-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted, using map.
使用map，并且除首字母大写外、以小写字母打印并排序所有环境变量的单行循环。
A multi-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted.
除首字母大写外、用小写字母打印并排序所有环境变量的多行循环。
A one-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted.
除首字母大写外、用小写字母打印并排序所有环境变量的单行循环。
This loop will create 26 documents, one for each lowercase letter of the alphabet, each document containing the character itself and its ASCII character code.
此循环将创建26个文档，代表字母表的每个小写字母，每个文档包含字符本身及其ASCII字符码。
A multi-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted, using map.
使用map，并且除首字母大写外、以小写字母打印并排序所有环境变量的多行循环。
For example, the compiler might generate a loop that iterates over all the occurrences of the letter a that it found.
例如，编译器可能生成一个循环，以循环访问它发现的所有字母匹配项。
For example, the compiler might generate a loop that iterates over all the occurrences of the letter a that it found.
例如，编译器可能生成一个循环，以循环访问它发现的所有字母匹配项。
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