He is an expert in computer networks.

I agree with your proposal.

He covered it with a lot of pizza.

I believe that the spirits of mountains and streams are watching over us.

The parts of this machine are severely worn.

These shoes wear out quickly because I use them every day.

The parts of this machine are severely worn and need to be replaced.

If you use them every day, shoes wear out quickly.

It's difficult to find the blind spot of that problem.

Please tell me that story once again.