Carbonaceous chondrite planetesimals were adsorbed on the mantle surface of the primitive earth, forming primitive carbon-rich areas.

碳质球粒陨石星子被吸积于原始地球上地幔表层，形成原始富碳区。

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The chemical compositions of the Ningqiang carbonaceous chondrite matrix and a dark rim are analysed with instrumental neutron activation method.

采用仪器中子活化方法分析了宁强碳质球粒陨石基质及暗色边化学成份。

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That is a necessary but not a sufficient condition, as the type of rock involved, called carbonaceous chondrite, is found in other asteroids, too.

他有两方面的证据：第一，现存的灾难性撞击的残骸与Baptistina和她的后代有相同的成分，这是必要条件，但并非充分条件，因为含碳的球粒状陨石在其它小行星上也有；

youdao

That is a necessary but not a sufficient condition, as the type of rock involved, called carbonaceous chondrite, is found in other asteroids, too.

ECONOMIST: Asteroid impacts

If the arrival was made of carbonaceous chondrite, it would have weighed 25 times as much as all the other carbonaceous chondrite material that had fallen over the previous half million years.

ECONOMIST: Paleoforensic science

Assuming that the figure was similar during the Cretaceous, it would be a long shot that the first fossil meteorite to turn up from 65m years ago was made of such a rock unless a huge extra supply of carbonaceous chondrite had suddenly arrived on the planet.

ECONOMIST: Paleoforensic science