The quality of this product is very high.

The engine of this car is very powerful.

This wood is easy to combust.

In order to increase the combustion efficiency of the engine, it is necessary to improve the quality of the fuel.

We are working to improve our service.

We are working on improving the project.

We are striving for the betterment of our services.

The efficiency of this machine is very high.

This car uses electricity as fuel.

He raised his hand and asked a question.