In mathematical terms, values that are not known with complete certainty are called random variables.
在数学术语中，不完全确定的值称为随机变量。
Webb: Yes, we can say that with complete certainty.
韦伯：是的，我们完全肯定地这样说。
Owing to the difficulty of sampling beneath the deep oceans, the composition of the oceanic crust is not known with complete certainty.
由于在深海底下取样困难，海洋地壳的组成就不完全确知。
Owing to the difficulty of sampling beneath the deep oceans, the composition of the oceanic crust is not known with complete certainty.
由于在深海底下取样困难，海洋地壳的组成就不完全确知。
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