还将说明选择特定代码、模式或查询以及备选方案（如果可能）的理由。

We will explain our justification for choosing a particular code, schema, or query, and the alternatives if possible.

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备选方案：如果选择所有选项，可能难于理解为什么Design Advisor建议它所做的事情。

Alternate approach: Selecting all the options can make it hard to understand why the Design Advisor recommended what it did.

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还要考虑到可能的备选方案，比如是选择混凝土重力坝还是选择填土筑堤大坝。

It also includes a consideration of possible alternatives, such as a concrete gravity dam or an earth-fill embankment dam.

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