The system has been upgraded several times since its opening.

"They've been talking about upgrading the system since the war started, which strikes me as a waste of time."

There is no question that the Rangers have upgraded their personnel since last season.

And I think we are the only bank that has been upgraded by all three rating agencies since the beginning of the crisis.

The security had been upgraded half a dozen times since the debacle seven years ago.

The Supreme Court building has not been upgraded since its completion in 1935.

Perhaps this restaurant has been refurbished and its food upgraded since my wife and I were there.

The main backbone connections have gradually been upgraded to optical fiber since 2008.

The rocket motor was capable of burning for approximately 87 s, having been upgraded since the previous flight.

To realise this project 10 million euros have been spent on upgrading the railway since 2002.