The system has been in operation for six months. 这个系统已经运行六个月了。 The company has been investing in new plant and equipment. 这家公司一直在投资购置新机器和设备。 A new system has been devised to control traffic in the city. 控制城市交通的'新系统已经设计出来。 Digital television has been around for some time now. 数字电视已经面市一段时间了。 A new advance has been made in the control of malaria. 在控制疟疾方面已取得新的进展。 上一篇：杭州有什么大学211 985 下一篇：值得称赞的英文短语 |