System

 

 

 

We have a good heating system.

There is an urgent need for a new system.

Our dorm's heating system isn't working properly.

There is an urgent need for them to update their system.

I think it wouldn't be too hard to come up with a better system.

The ancient Greeks knew as much about the solar system as we do.

I'm sure it wouldn't be too hard to find out who hacked into our system.