There have been many changes in recent years.

　　近幾年發(fā)生了許多變化。

　　A new system has been devised to control traffic in the city.

　　控制城市交通的新系統(tǒng)已經(jīng)設(shè)計出來。

　　We had to work within the parameters that had already been established.

　　我們必須在已設(shè)定的范圍內(nèi)工作。

　　No new SARS cases have been reported in the region.

　　該區(qū)沒有新增非典型肺炎病例。

　　The information has been placed in the public domain.

　　這資料不受版權(quán)保護(hù)。