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natural resource
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natural resource
Encyclopedia
经济学
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natural resource
自然资源
人类社会可以利用的天然存在的自然物。不包括人类加工制造的原材料。是生产的原料来源和产业布局依据。
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railway track maintenance and renewal
railway traction network
railway traffic accident
railway traffic capacity
railway traffic control
railway traffic hygiene quarantine
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railway transportation asset and resource
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railway tribology
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