Individual fields can be hidden or restricted by modifying the field properties (see figure 4).

可以通过修改字段属性来隐藏或限制单个字段(参见图4)。

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In this case, you might lack setter methods to modify field properties and, instead, rely on constructors to set these values.

在这种情况下，您可能会缺少用于修改字段属性的setter方法，相反，您依靠构造器来设置这些值。

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Why are there limitations to changing field properties?

为什么会有更改的字段属性的限制？

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These discoveries have given birth to a field of endeavour that is known as spintronics, because the magnetic properties of a material depend on a quantum-mechanical property of electrons called spin.

ECONOMIST: Spintronics