In this experiment, we will use the International System of Units.

He is deeply involved in the study of the meridian system.

We use this coordinate system to locate the position of an object.

The ecosystem of this lake is very fragile.

In physics, the inertial frame of reference is a very important concept.

This system is very complex.

He believes in the god of water.

This lake is fresh water, and you can drink it.

This tree has completely withered away.

My zodiac sign is Sagittarius.