Can't be sunk in heavy clay soil or rock.
不能在重黏土或岩石中打这种井。
Crusting of heavy clay soils after rainfall often causes poor emergence of crop seedlings from soil or even failure of a crop.
紧实土壤降雨后常由于板结而严重影响作物出苗，导致建植不良乃至失败。
For example, if one portion of pipe is in heavy clay soil and another is in well-aerated sandy soil, the portion in the clay will corrode with respect to the portion in the sand.
例如，管道的一部分在重质粘土中，另一部分在透气好的砂土中，粘土内的管段相对于砂土内的管段被腐蚀。
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