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.
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