root opening

例句：

1. 1.The roots of the tree are exposed to the soil during the winter months.
   这棵树的根在冬天暴露在土壤中。
2. 2.The root opening is where the roots penetrate the soil.
   根开口是根穿透土壤的地方。
3. 3. The plant's root opening is larger than usual, indicating that it has grown more quickly.
   植物的根开口比平常大，表明它生长得更快了。