还有个比较特殊的字符串重复(string repetition)操作符，它是一个小写字母x。 此操作符会将左边的操作数(也就要重复的字符串)与它本身重复相连，重复次数则由右边的操作数指定。
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第二，如果需要重复短字符串来创建长字符串，可以使用 * 运算符，将字符串重复一定的次数。
Second, if you need to repeat a small string to create a bigger string, you can use the * operator, which multiplies a string out a set number of times.
这种方法对于压缩非常有用，因为它往往容易压缩拥有多行重复字符的字符串。
This approach is useful for compression because it tends to be easy to compress a string that has runs of repeated characters.
现时标志是一个由发送方(签名者)新生成的无重复字符串，这样目标接收方就能检查其唯一性了。
A nonce is a non-repeating string freshly generated by the sender (the signer) such that the intended recipient can check its uniqueness.
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