This river and that river confluence here.

The false rumor hurt his reputation.

He is scheduled to have surgery for an aneurysm.

This perfume contains ambergris, an expensive ingredient.

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

The troposphere is a part of the Earth's atmosphere, extending from the surface to about 10 kilometers.

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.

This perfume uses expensive ambergris.

I measured the current using an ammeter.