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drain pipe
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【化】 排泄管; 疏水管
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详细解释：
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以下为句子列表：
英文: Abstract: The permeability of 12 types of geotextiles, used as sub-drain pipe filters, were tested andcompared under two kinds of soils sampled from Ningxia Yinbei Drainage Project area.
中文: 文摘:采用一维和二维渗透模型对土工织物作为农田暗管排水外包滤料进行了试验研究。
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