用户从有效的可替换的文法中选择，这种设计在本质上是一个自我建档的有限的查询工具。
The user chooses from a grammar of valid alternatives, so the design is in essence a self-documenting, bounded query facility.
有好多文法规则可以供选择，原则是应在信函的全文中保持文法的一致性。
Many rules of grammar are a matter of choice, but your choice should be internally consistent within the letter.
所以你必须依照你的需求，选择取得物件的方式，然而，使用第一种方式将有保持样板文法的最小性。
The method you choose will be determined by your needs, but use the first method whenever possible to keep template syntax to a minimum.
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