科学家们认为在大气层下存在着一层由碳和氧组成的稀薄地壳。

Under the atmosphere, scientists think there is a very thin crust of carbon and oxygen.

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科学家认为在大气圈内，存在着由碳和氧较重元素组成的壳层。

Under the atmosphere, scientists think there is a very think crust of carbon and oxygen.

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石墨烯是一种超强度的单层碳——只有一层原子那么厚。

Graphene is a super strong sheet of carbon that's only one-atom thick.

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碳单原子层的另一个特性是它的强度。

Another of graphene's qualities is that it is strong.

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碳单原子层的另一个特性是它的强度。

Another of graphene's qualities is that it is strong.

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