Now they have demonstrated that such systems can be modified and made more complex.

The electoral system was modified for the 1985 elections.

He said he hoped the system would be modified to take such factors into account.

In fact, I'd guess that the whole system has been thoroughly modified.

The system was modified somewhat in the fourth English edition.

The sound system has been modified, and players can now hear other cars around them.

In 1949 the system was modified, giving women the right to vote.

The system has been running from many years, but was heavily modified in 2007.

For several months now, many systems on the Discovery have been modified.

Two mouse clicks and forty seconds later the system was modified.