He wrote a poem using the four treasures of the study.

Analytical chemistry is a science for clarifying the components and structure of substances.

He is majoring in syntax at university.

You can use spectroscopy to examine the components of a substance.

We conducted a meta-analysis on this issue.

I like reading uncle's composition.

He is majoring in humanities at university.

Please complete this fill-in-the-blank text.

One part is important.

Please remove the core of this apple.