回车

Please press enter key when you see the main menu on the screen.

上出现主菜单时请按回车键。

For text-mode files, carriage return–linefeed pairs are counted as single characters.

对文本模式的文件，回车换行作为一个字符。

Serial.print(b, BYTE) prints b as a single byte followed by a carriage return and a linefeed.

以单个字节出b，并同时跟随一个回车和换行符。