He is interested in the Song pronunciation.

The doctor told him that he might have been infected with syphilis.

In this forest, various organisms live by building a relationship of mutualism.

The destruction of the ozone layer has a significant impact on the Earth's climate.

She had her ovaries checked by a doctor due to a problem.

She is researching about medieval chastity belts.

She is researching about the chastity belts of medieval Europe.

He opened the window to let fresh air into the room.

I bought a new drying machine.

In this chemical experiment, we will use litharge.