He is an expert in dynamics.

He is an expert in dynamics, helping to solve complex problems in physics.

Understanding the principle of electromagnetic induction is very important in learning physics.

The fire truck went into action because of the fire.

Alkaline earth metals are one of the main components of the earth's crust.

We took a walk in the primeval forest over the weekend.

Her family adopts a matriarchy.

Asexual reproduction is a method where the parent's genetic information is directly passed on to the offspring.

He has been working on this project for many years.

You can also listen to this movie in English with the secondary audio.