如果使用BPEL，重要的是BPEL要控制高级步骤，而不是被用作一种可视编码语言来执行低层逻辑。
If BPEL is used, it is important that BPEL is controlling the high level steps, not being used as a visual coding language to perform low-level logic.
本文章系列所持的一个基本宗旨就是，函数式语言应该为您处理更多低层面的细节。
One of the underlying tenets of this series is that functional languages should handle more low-level details for you.
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.
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