He is knowledgeable in all fields of learning.

He is widely recognized as an expert in dogmatics.

He is majoring in the study of national law.

He understands the basic concepts of thermodynamics.

Day after day, he continued to strive to solve the problem.

I can't find my skeleton key.

This mineral is called lepidocrocite, a type of iron oxide.

He struck it rich in the lottery.

He felt sick and vomited.

He drew a beautiful scenery.