soil line

• 厕所污水管,粪便管

soil line的用法和样例：

例句

1. A bacterial or fungal disease of certain plants, such as the cabbage and potato, that causes the stems to turn black at the soil line.
   黑胫病某些植物，如卷心菜和土豆的一种细菌或真菌疾病，引起茎干在与土接壤处变黑