He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

I have been to Kikonai.

He is an expert in paleontology.

Teruhiko is my best friend.

I have been to Hohhot.

We went on a trip on a big ship.

He was playing by swinging the tree branch.

My grandfather is good at repairing old pendulum clocks.

The owl is hooting in the night forest.

He was solving the exam questions without looking away.