科马提岩于1969年首次被发现，它是地球上已知的最古老的火山岩，含镁量是大多数火山岩的三倍。

First identified in 1969, komatiites are Earth's oldest known volcanic rocks and contain three times as much magnesium as do most volcanic rocks.

youdao

唐海岩是黑龙江人，毕业于北京体育大学，并在北京首师实验中学担任体育老师。

The Heilongjiang, China, native is a graduate of Beijing Sport University and serves as a physical education teacher at Beijing Shoushi Middle School.

youdao