He hesitated, unable to make a decision.

He hesitated and couldn't make a decision.

His new suit was dark blue, and it looked very stylish.

The crawling baby is playing in the living room.

Aiko is my best friend.

Mr. Ukitada is my best friend.

He goes to the gym every day to train his quadriceps.

Visceral muscles are muscles that move the internal organs of the body.

Child marriage is a social phenomenon that is a problem all over the world.

In statistics, the concept of autocorrelation is very important.