He felt anger towards the corrupt officials.

He was known as a corrupt official.

The unit price of this product is 500 yen.

Calcium carbide is a major raw material for acetylene gas.

He was injured, so we carried him on a stretcher.

The tanker has entered the port.

What does this at sign mean?

Hydrocarbons are fundamental components of organic chemistry.

Hydrocarbon is a basic element of chemical reactions.

In chemistry class, I learned about alkanes.