That brings me to another variable we need to consider, the acoustic characteristics of the building materials as well as the wall and floor coverings.

那让我想起另一个我们需要考虑的因素，建筑材料的声学特性，以及墙壁和地板的覆盖物。

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That brings me to another variable we need to consider—the acoustic characteristics of the building materials as well as the wall and floor coverings.

这就引出了另一个我们需要考虑的变量——建筑材料、墙壁及地板覆盖物的声学性质。

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The part that involves policy and rules is deciding whether or not the controls can be static or whether some of the characteristics change over time or some other business variable.

涉及策略和规则的部分是决定控制是静态的，还是某些特征会随时间或其他业务变量而变动。

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