域级别的通道能够作为位于任意构件层级内部的生产者的目标。
Channels at the domain level can be used as targets for producers at any level within the composition hierarchy.
在服务端，你可以检测这个域的值：如果它包含任意文本，它肯定是个机器人。
On the server side, you will check the value of the field: If it contains any text, it must be a bot.
从hashcash概念整体来看，具体域和分隔符的使用从某种程度上说是任意的。
Given the overall concept of hashcash, the use of its specific fields and delimiters is somewhat arbitrary.
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