In physics, the study of the 'nucleus' at the center of an atom is important.

Your signature is needed on this contract.

The cherry blossoms in the park are still half in bloom.

He explained the justification for his actions.

He caused a revolution in science.

He signed the contract.

This law has already been abolished.

I think this old custom should be abolished.

This park is open to everybody.

I was appointed as the leader of the new project.