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各种复杂性使DTD很难以通用的方式表示哪些属性应当具有id语义。
A variety of such complexities has made it difficult to express in a general way which attributes are meant to have ID semantics.
考虑到管理并发更新的相对复杂性，我们提出一个相关的建议：尽可能使用无状态语义。
Given the relative complexity of managing concurrent updates, we make one related recommendation: Where possible use stateless semantics.
把字句主语语义角色的复杂性反映了动词的语义角色与句式的论元不一致。
Semantic role complexity of subject in ba sentences reflects the inconsistency between the semantic role and the argument of the sentence.
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