欧洲石器时期最大的土木防御工事位于威尔特郡的西尔布利山。Europe's biggest Stone Age earthworks are at Silbury Hill in Wiltshire.该防御工事能抵御当时所使用的各种进攻手段。The fortress was proof against the techniques of attack then in use.该团在等待敌人进攻之时,加强了防御工事.The reg...
他选择了攻读耶鲁大学的经济学硕士学位。He took a master's degree in economics at Yale.该课程比硕士学位课程更注重实践。The course is more practically based than the Masters degree.我拿文科硕士学位其实就是觉得好玩儿。I took my M. A. just for fun really....