The inner core of the Earth is mainly composed of iron and nickel.

The inner core of the Earth is extremely hot and is mainly composed of iron and nickel.

He warned about the dangers of nuclear warheads.

In Japanese, the accent kernel greatly affects the pronunciation of words.

The use of nuclear bombs is one of the greatest threats to mankind.

He is studying thermodynamics in depth.

Lassa fever is a serious infectious disease that is particularly prevalent in West Africa.

His enthusiastic cry livened up the entire venue.

His dream is to fly in the sky in a hot-air balloon.

My friend contracted Q fever.