Mr. Ogisu is my friend.

He is good at seeing through camouflage.

He was using a fake name to disguise his true identity.

He is a very excellent performer.

After the accident, he learned to use an artificial limb.

Mr. Yamagishi is my best friend.

Formic acid is a compound often used in organic chemistry.

Formate is an important compound in organic chemistry.

My sister-in-law is a doctor.

My parent-in-law is very kind.