一般来说，选用熟悉的定位器表达式，并在脚本结构中保持一致。
In general, choose familiar locator expressions and be consistent in script structure.
化学式：化合物的组成或结构的任何一种表达式的总称。
Chemical formula: Expression of the composition or structure of a chemical compound.
我们可以看到，当标示符被省略的时候，这样的结构只能是一个函数表达式。
We can see that when identifier is omitted, that "something" can only be an expression.
着重讨论了目标结构的设计和表达式的翻译。
The design of its object program and translation of its expression are especially discussed.
着重讨论了目标结构的设计和表达式的翻译。
The design of its object program and translation of its expression are especially discussed.
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