“（在月球永久性阴暗区的）这些发现是数以万年的历史沉淀下来的，”Schultz说道，“它对探索地球的起源，以及太阳系、银河系的发源都有一定的指导意义。

'There's this archive of billions of years (in the Moon's permanently shadowed craters), ' Schultz said. 'There could be clues there to our Earth's history, our solar system, our galaxy.

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同样输送速度一定，混合此高至使粉尘物料在管道底部形成永久性沉淀层时，这时的混合比即为临界混合比。

Likewise, permanent sediment layers are formed with the fixed conveying speed and a certain higher degree of mixing ratio which called as Critical mixing ratio.

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