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单词
nutrients
释义
nutrients
Encyclopedia
工学
营养素
释
nutrients
营养素
食物中能被吸收及用于增进健康的化学物质。是维持正常生命活动所必需摄入的食物成分。
理学
营养盐
释
nutrients
营养盐
生态系统中的初级生产者(主要是浮游植物)维持生长发育与新陈代谢生命活动过程必须的元素(金属离子、氨离子和酸根离子组成的化合物)。
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Railroad Revitalization and Regulatory Reform Act (U.S.)
railroad track problem
rail/sleeper laying and replacing machinery
rail transit
rail transit engineering survey
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rail transit station public area
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rail transport vehicle
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