trunk drainage ditch

例句：

1. 1. The trunk drainage ditch is essential for the growth of the tree.
   树根排水沟对于树木的生长至关重要。
2. 2. The construction of the trunk drainage ditch has been completed.
   树根排水沟的建设已经完成。
3. 3. The trunk drainage ditch was designed to prevent water from seeping into the soil.
   树根排水沟的设计是为了防止水分渗入土壤。