The other problem is that submarines receive messages using low-frequency radio waves that can penetrate water, but only a few characters per second can be transmitted at these frequencies.
另一个问题时潜艇在水下时用低频进行通信，因为低频可以穿透海水传播，但用低频通信时，通信速度只能每秒几个字符。
These Numbers will be outside the range of possible valid characters; thus, the lexer can return individual characters as themselves, or special tokens using these defined values.
这些数字将会在可能的合法字符范围之外；这样，lexer可以原样返回单个字符本身，或者返回使用这些定义值的记号。
These additional characters, also called supplementary characters, can be represented in UTF-8 using 4 bytes.
这些额外字符也称为补充字符，可以在utf - 8中用4字节表示。
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