He is really knowledgeable and always teaches us new information.

I will take a flight in economy class.

I rode on a first-class airplane for the first time.

I booked a business class for the next flight.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He is an excellent troubleshooter, good at solving difficult problems.

My specialty is computer troubleshooting.

He is wearing a pacemaker because of his heart problem.

I bought a new coffee maker.

He is known as an excellent pattern maker.