reed root

例句：

1. 1. The reed root is a common plant in marshy areas.
   芦苇根是沼泽地区常见的植物。
2. 2. The roots of the reed were used to make boats.
   芦苇的根部被用来制作船只。
3. 3. The reed root was used as fertilizer for agriculture.
   芦苇根被用作农业肥料。