We transform scrap into raw materials and thus return resources to the material cycle.
我们从废料中提取有价值的原料，并将其导回材料循环中。
The economic result of energy transformation and material cycle is to create use value.
能量转化和物质循环的经济成果是创造使用价值。
As a key aspect of material cycle and energy flow of lake ecosystem, decomposition of lake aquatic plants is one of the main process of maintaining the lake ecosystem functions.
水生植物腐烂分解作为湖泊生态系统物质循环以及能量流动的关键环节，是维持湖泊生态系统功能的主要过程之一。
Water sediment (sediment) is an important part of the rivers, lakes and other natural water ecosystems, and it's also a significant integral link of material cycle in water ecosystem.
水体底泥？(沉积物)是河流、湖泊等自然水体生态系统的重要组成部分，也是水体生态系统物质循环中的一个重要环节。
Urban ecosystem is the continental ecosystem centering round mankind, with its structure changed, material cycle and part of energy conversion forms reformed.
城市生态系统是人为改变了结构、改造了物质循环和部分改变了能量转化的、长期受人类活动影响的、以人为中心的陆生生态系统。
Urban ecosystem is the continental ecosystem centering round mankind, with its structure changed, material cycle and part of energy conversion forms reformed.
城市生态系统是人为改变了结构、改造了物质循环和部分改变了能量转化的、长期受人类活动影响的、以人为中心的陆生生态系统。
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