This perfume contains ambergris, an expensive ingredient.

The length of the telomere is one of the indicators of cellular aging.

Oleum is a very dangerous chemical, and it requires great caution when handling.

The flow of the river is very quiet and comfortable.

Last night, a mudslide occurred, and our town suffered significant damage.

Hydrogen sulphide is extremely toxic, and particularly at high concentrations, it is lethal to humans.

He is involved in the research of particle accelerators.

We need to measure the strength of this electric current.

The police detained him in the detention center.

He stood up and started talking.