物体定义
双语例句原声例句
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世界对象并不保存物体定义对象的引用。
The world object does not keep a reference to the body definition.
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如果物体定义为零质量，那么它的默认状态就是静态的。
Bodies have zero mass by default, therefore they are static by default.
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设置的过程与地面物体的创建相似，只不过需要为动态物体定义额外的一些属性。
This setup is similar to the creation of the ground body, except that you define additional attributes for the dynamic body.
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It allows you to define the concept of a thermometer. You have three objects, one of them could be a thermometer.
从热的物体流向冷的物体,由此我们可以定义温度，我们还可以用它来定义温度计：
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Let us say P for plane, G for ground, O for object.
我们定义 P 是平面,G 是地面,O 是物体
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