His model, he said, was sheathed in a black plastic shell, so he did not see its design.

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。

youdao

But because they were unable to precisely model the complex nanostructures found in the shell, the solar cell had a low conversion rate.

但是因为他们不能在外壳上准确地模拟复杂的纳米结构，因此太阳能的捕获率很低。

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This is the shell model.

这就是核壳模型。

youdao

This is the shell model.

这就是核壳模型。

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