不可变属性的存取器将总是具有值引用，因而调用的任何一方都不需要防御性复制，这使得它们效率更高。

Accessors for immutable properties will always have value semantics and do not need the defensive copying on either side of the call, making them more efficient.

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之前提到过存取器访问如何比直接访问慢，这例子说明，某些语言约会定导致不可见的性能问题。

Earlier we talked about how accessors are slower than direct field accesses, so this is an example of a certain language idiom resulting in an "invisible" performance hit.

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目前，绝大多数USB接口设备是以明文的形式进行数据的存取与传输，这就不可避免的带来了安全隐患。

At present, most USB interface equipments store and transmit data in plaintext form, unavoidable potential safety menace has been brought.

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