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.

Verbs of the lower second conjugation are important for understanding Japanese grammar.

In learning Japanese grammar, understanding the upper two-step conjugation is important.

When learning Japanese grammar, it is important to understand verbs of the upper monograde conjugation.

An affricate refers to a specific type of sound in phonetics.