He is an expert in bibliography and works in many libraries.

I am majoring in economics at university.

He is in the third year of junior high school.

We inspected the factory.

I am majoring in climatology at university.

There is an active mountaineering club at my university.

He loves mountain climbing.

He looked up at the mountains and was moved by the beauty of nature.

He always likes to be pedantic, explaining things down to the smallest detail.

He is a world-renowned agronomist.