在物理学上最著名的二元性例子就是波粒二象性，这表明物同时具有波和粒两种属性。

The most famous duality in physics is the wave-particle duality. This one states that matter has both wave-like and particle-like properties.

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您可能非常想利用象属性那样的语法把一些声明设置成外部实体中的缺省属性。

You may be tempted to exploit the attribute-like syntax to have some of your declarations set up as default attributes in an external entity.

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这两种方法可以让您在属性适合作为列表发挥作用的情况下象对待列表一样对待每个节点属性。

These let you treat each node attribute as if it is a list in those contexts where it would be nice for the attribute to behave like a list.

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