With the world defined, you specify the ground body within that world and its position.

定义了此世界后，就可以指定该世界内的地面体及其位置了。

youdao

The next two segments in the setup phase define the static ground body and the dynamic sphere body.

设置阶段的下两个部分是定义静态的地面和动态的球体。

youdao

This setup is similar to the creation of the ground body, except that you define additional attributes for the dynamic body.

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。

youdao

This makes it more difficult for the body to effectively use the same amount of oxygen as it would on the ground.

VOA: special.2009.07.14

Picture my body lying on the ground unconscious.

想像我的身体无知觉地躺在地上。

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Experts say the body begins losing oxygen minutes after an airplane leaves the ground.

VOA: special.2009.07.14

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