He decided to start a manual labor job.

The sympathetic nervous system controls the body's stress response.

The International System of Units is a standard of measurement widely used around the world.

The International System of Units is the standard measurement system used by scientists all over the world.

The peripheral nervous system plays a role in transmitting commands from the central nervous system to various parts of the body.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

He decided to quit his job because it was a low salary.

His behavior became grounds for suspicion.

On is always maintaining a calm attitude.

He was worried about starting a new project, but I advised him, 'Doing something is easier than worrying about it.'