把月球上的物质带回地球。
它们实际上在落在地球上的陨石物质中占了接近总数。
They actually account for almost all of the meteorite material that falls to earth.
直至今天锗才毫无异议地成为地球上是纯净的物质。
Until today germanium is the present substance on earth with no exception.
地球上没有稳定同位素的最轻的物质是什么?
What is the lightest element on Earth, with no stable isotope?
这种毒素是地球上最危险的物质之一。
This toxin is one of the most dangerous substances on earth.
发现一颗新的行星和在地球上找到一种新的物质,是同样了不起的收获。
Finding a new planet and finding a new material on earth is a great harvest.
发现一颗新的行星和在地球上找到一种新的物质,是同样了不起的收获。
Finding a new planet and finding a new material on earth is a great harvest.
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