Mafic igneous rock, a widely distributed and typical mantle-derived rock, has become a major research source for revealing possible mechanisms for the chemical evolution of the mantle.
镁铁质火成岩作为分布最为广泛的典型幔源岩石，已成为探索地幔化学性状及示踪岩石圈深部过程的主要研究对象。
These microscopic impurities, derived from rock and from organic material in creatures that once lived on an ancient ocean floor, have undergone an amazing journey.
这些来源于岩石和曾经生活在远古海洋板块的的生物中的有机物的微观杂质，已经经历了一个令人惊异的旅程。
The domestic pigeon, derived from the rock pigeon, is the world's oldest domesticated bird.
家鸽是从野鸽分化而来的，是世界上最早被人类驯化的鸟类。
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