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单词
sand filter trenches
释义
sand filter trenches
sand filter trenches
A system of trenches, consisting of perforated pipe or drain tile surrounded by clean, coarse aggregate containing an intermediate layer of sand as filtering material and provided with an underdrain for carrying off the filtered sewage.
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ulurp
uluru
uluru / ayers rock
uluru-kata tjuta national park
uluru national park
uluru rock
ulus
ulusal akademik að ve bilgi merkezi
ulusal medikal kurtarma ekibi
ulus (disambiguation)
ulus jochi
ulusnye golovy
ulusnye liudi
ulutau
uluv
ulv
ulva
ulvaceae
ulvales
ulvc
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ulvf
ulvi radzhab
ulvophyceae
ulvospinel
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更新时间:2025/11/29 12:13:31