他们沿校墙挖沟.They dug a dike along walls of the school.挖沟以排水.Dig trenches to drain away the water.他们挖沟以阻止森林大火蔓延.They dug trenches to keep the forest fire from spreading....
其中必有隐情.There must be something behind it.玛丽的拒绝另有隐情, 我想她是在力图隐瞒什么东西.There's more in Mary's refusal than meets the eye; I think she's trying to hide something.背后定有隐情.There must be something behind....
Once the decision to expand was taken , the privates could become sergeants, the sergeants officers.一旦决定扩充, 小兵就会变成军士, 军士就会变成军官.Privates: We were told to stay here and wait for further instructions. Sir!士兵们: 我们被要求在这儿等候指示....