换行

The wordwrap() function wraps a string into new lines when it reaches a specific length.

将字符串按字符个数。

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

文本模式的文件，回车作为一个字符。

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

以单个字节输出b，同时跟随一个回车和符。