他們沿校墻挖溝.They dug a dike along walls of the school.挖溝以排水.Dig trenches to drain away the water.他們挖溝以阻止森林大火蔓延.They dug trenches to keep the forest fire from spreading....

“挖溝”的英語可以翻譯為：ditch (up)，ditching ...