Astronomers can also use a knowledge of Earth materials, processes and history to understand other planets - even those outside of our own solar system.
天文学家同样可以根据他们对地球构成、活动和历史的了解来了解其他行星甚至太阳系之外的行星。
The main problem existing in the production of metal Nd include raw materials, processes, manpower and equipment.
金属钕生产中存在的主要问题有原料、工艺、人力及装备。
The main problem existing in the production of metal Nd include raw materials, processes, manpower and equipment.
金属钕生产中存在的主要问题有原料、工艺、人力及装备。
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