这些前瞻性陈述包括了一些已知和未知的风险和不确定因素，事实结果会同这些预测产生巨大的分歧。

These statements involve known and unknown risks, uncertainties and other factors, which may cause actual results to be materially different from those expressed or implied in the statements.

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因为其地幔的未知混合物，火星形成历史上还有诸多不确定因素。

There have been large uncertainties in the formation history of Mars because of the unknown composition of its mantle, the rock layer that underlies the crust.

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因为其地幔的未知混合物，火星形成历史上还有诸多不确定因素。地幔是一个位于地壳下面的岩石层。道法斯说道。

There have been large uncertainties in the formation history of Mars because of the unknown composition of its mantle, the rock layer that underlies the crust. Dauphas said.

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