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.
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.
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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