So musical instruments evolved in ways that optimize their acoustical properties, how the instrument vibrates and sends those vibration through the air to our eardrums.

因此，乐器的进化优化了它们的声学特性，且优化了乐器振动的方式，并将这些振动通过空气传到我们的耳膜。

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After 24 pages we reach a much better design, which mainly USES a map to store properties rather than sub-classing for each type of instrument.

在24页之后，我们看到了更好的设计，主要用map来存储属性，而不是为每种乐器类型建立子类。

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You must know the properties of the instrument before you use it.

但你使用这种仪器之前，你必须先弄清楚它的各种性能。

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Disentangling the two relationships is impossible unless a third variable with the right statistical properties, a so-called instrument, can be found and exploited.

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The United States embargo against Cuba is an economic, commercial and financial instrument enacted on February 7, 1962 after Cuba expropriated the properties of U.S. citizens and corporations.

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