他说原型机的模型被装在一个黑色的塑料外壳中，因此无法窥见其中设计。
His model, he said, was sheathed in a black plastic shell, so he did not see its design.
一种主流看法认为是重力潮汐作用改变了月球的外壳，并使其向一侧倾斜，但该新理论是以解释月球成因的“大碰撞”模型为基础的。
One leading idea is that gravitational tidal forces reshaped the moon's crust and made it lopsided. But the new theory builds on the "giant impact" model that explains the moon's creation.
在某些情况下，组件外壳从模型直接生成；不过，可以始终根据模型手动创建组件外壳。
In some cases, component shells are generated directly from the model; one can always hand-create the component shells from the model.
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