The prop parameter will contain two properties.

prop参数将包含以下两个属性。

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Each time the loop is executed, the prop variable is filled with the name of another property (a string) that exists on the object until all properties have been returned.

每次循环执行，属性变量被填充以对象属性的名字(一个字符串)，直到所有的对象属性遍历完成才返回。

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We will now add a prop model with physics properties.

我们现在添加有物理性的道具模型。

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