战壕口腔牙龈炎

例句：

1. 1. The soldiers dug deep trenches to defend their position.
   士兵们挖深壕沟来防守他们的阵地。
2. 2. The enemy was forced to retreat due to the depth of the trench.
   由于壕沟的深度，敌人被迫撤退。
3. 3. The engineers carefully excavated the trench for the new road.
   工程师们仔细挖掘了新的路堑。