roots的同类词为tranks
例句
1、
Firm more soil over the roots and water thoroughly.
在根上再多培些土，用水浇透。
2、
As their roots are strong and penetrating， they prevent erosion.
它们的根十分粗壮而且扎得很深，从而避免了受侵蚀。
3、
Make sure that you bed the roots firmly in the soil.
一定要使根部牢牢地扎在土壤里。
