This factory strictly controls the emission of hydrogen sulphide.

The troposphere is the lowest part of the Earth's atmosphere, and most of the weather occurs here.

Carina is one of the constellations in the southern hemisphere.

We have a match every week.

He can speak many languages.

He was newly promoted to corporal.

Please tell me the Go-on reading of this kanji.

Do you know the etymology of this word?

My mother tongue is Japanese.

Ex post facto law refers to punishing an act with a law that was enacted after the act became a crime.