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Terms for subject Ecology (19504 entries)

under aeration	底部曝气
under seal	盖上公章
underbush	矮丛林
underdrain	地下排水管
underground pipe system	地下管网
underground plastic sheet wall	地下地膜节水墙
underground river system	地下河系统
undergrowth	下木层
undergrowth	林下植被
understory plant	林下植物
undertake treatment within a prescribed limit of time	限期治理
undifferentiated discharge permit	无差别排放许可证
undissolved matter	不溶解物质
undissolved solid	不溶解固体
undisturbed black soil	未干扰黑土
uniflow tank	直流池
uniform index	均匀度
uniform minimum environmental standards	统一的最低环境标准
uniformity of washing	洗沙均匀度
uniformly-mixed system	完全混合法