He bought a safe to store bullion.

He is collecting stamps.

He stood up and started talking.

He decided to study abroad in America.

He is an international student from America.

A fermion is one of the fundamental constituents of matter.

We need to measure the strength of this electric current.

Many types of fish inhabit this river basin.

This electrical appliance requires a direct current power supply.

This river and that river confluence here.