语义等价使得比较成为可能，它允许丢弃 XML 中不重要的成分如可以忽略的空格，从而可以进行有效的比较。
Semantic equivalence makes that comparison possible -- it allows insignificant aspects of XML, like ignorable whitespace, to be discarded and a valid comparison to be made.
副捕获物不允许丢弃，相反它必须上岸卸载并做为这艘船的配额的一部分被记录。
Bycatch must not be discarded. Instead it must be landed and recorded as part of that boat's quota.
INS V2.2不允许用户保存或丢弃他们的订阅，它是自动保存的。
INS V2.2 does not allow the user to save or discard their subscription; it is automatically saved.
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