This phenomenon follows a specific law.

This school has strict rules.

This car is equipped with an automatic transmission.

I will take a little rest.

When an object is in free fall, its terminal velocity is determined by the balance between gravity and air resistance.

An irregular galaxy is a type of galaxy that does not have a definite shape.

He sent a reminder letter about the unpaid charges.

This new jet can fly at supersonic speeds.

His hobby is astronomical observation.

I can't keep up with his irregular schedule.