Note: The two-digit line numbers on the very left edge of the listing are for explanation purposes; they don't appear in the code.

注意：清单左端的两位数行号仅用于解释目的；它们不出现在代码中。

youdao

Note: The two-digit line numbers on the very left edge of the listing are for explanation purposes; they don't appear in the code.

注意：清单左端的两位数行号仅用于解释目的；它们不出现在代码中。

youdao