are是什么意思

　　We are still friends, though, which is good.

　　不过我们仍然是朋友，这令人感到欣慰。

　　There have been many changes in recent years.

　　近几年发生了许多变化。

　　There are still a few residual problems with the computer program.

　　电脑程序还有一些残留问题。

　　No new SARS cases have been reported in the region.

　　该区没有新增非典型肺炎病例。

　　A number of measures were taken to alleviate the problem.

　　采取了一系列措施缓解这个问题。

　　The two leaders are battling for control of the government.

　　两位领导人正在争夺政府控制权。

　　There are qualitative differences between the two products.

　　这两种产品存在着质的差别。