Spectroscopy is an important means of investigating the properties of matter.

He is an expert in Classical Chinese text studies, and is good at interpreting ancient Chinese literature.

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.

He is an expert in enzymology and has conducted many studies in that field.

He is an expert in medicine.

He is learning the basics of elementary learning.

He clenched his lower jaw tightly to endure the pain.