His research mainly focuses on the plantigradism of mammals.

He learned about unguligradism in his zoology class.

In Japanese grammar, 'n-row irregular conjugation' is a very important concept.

The Acts of the Apostles is a part of the New Testament.

His actions were considered part of propaganda by action.

He conveyed the schedule of the meeting in a three-line email.

I use a set square to draw shapes.

In chemistry class, I learned about acid anhydride.

In chemistry class, I learned about acidic oxides.

Lower fatty acids play an important role in the human body.