He used to be a member of the Chinese gang.

He experienced the harsh reality of the underbelly of society.

A healthy diet and moderate exercise help boost immunity.

He is an expert in mechanics.

The Earth maintains its shape due to centrifugal force.

He has a strong ability to get things done to make the project successful.

His imagination is infinite.

This contract takes effect from the date of signature.

He abused that power.

The infectious capacity of this virus is very strong.