一条语法规则，不管如何正确，除非能懂，否则毫无用处。
A grammar rule, however true (it is), is useless unless it can be understood.
除非把书本知识应用到实践中去，否则它仍然停留在理论层面，这样最终就毫无用处。
Unless it is applied to real experiences, book knowledge remains theoretical and, in the end, is useless.
虽然可以为一般dtd中的任何标记创建新的等价元素，但是除非内容模型包含也进行专门化的标记，否则这对作者来说毫无用处。
Although you could create a new element equivalent for any tag in a general DTD, this work is useless to you as an author unless the content models that would include the tag are also specialized.
远远不只是一副漂亮的图画，该模型必须是所存储数据的完整表示，否则，它对于任何人都毫无用处。
Far from just a pretty picture, the model must be a complete representation of the data you are storing, or it will be of little use to anybody.
除非学者们能拥有影响等大范围的人群，否则他们的理念将几乎毫无用处。
Until scholars can reach a wider audience, their ideas will have little use.
近些年来，学科已经细化到了相当的程度以至于学者们的理念只影响小范围的人群。除非学者们能拥有影响到大范围的人群，否则他们的理念将几乎毫无用处。
Academic disciplines have become so specialized in recent years that scholars' ideas reach only a narrow audience. Until scholars can reach a wider audience, their ideas will have little use.
近些年来，学科已经细化到了相当的程度以至于学者们的理念只影响小范围的人群。除非学者们能拥有影响到大范围的人群，否则他们的理念将几乎毫无用处。
Academic disciplines have become so specialized in recent years that scholars' ideas reach only a narrow audience. Until scholars can reach a wider audience, their ideas will have little use.
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