没有表达式树的话，我们是不可能用描述格式来表示一个表达式的。他们唯一的表示方式是IL(中间语言)，这种语言对于重新表述用户的意图来说太低层次了。
Without expression trees, its impossible to describe expressions in a descriptive format; the only description of them is IL, which is too low level to re-create the user's intent for the expression.
本文描述的计算机选案子系统采用语义文法结构，中间语言采用语义依存树的形式。
The computer aided tax system described in this thesis is a semantic grammar system, with the semantic dependency tree as the intermediate language.
提出了语义查询树的中间语言结构，设计了查询语句向语义查询树的转换算法。
The idea that use the structure of semantic meaning query tree as middle language is put forward.
提出了语义查询树的中间语言结构，设计了查询语句向语义查询树的转换算法。
The idea that use the structure of semantic meaning query tree as middle language is put forward.
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