We often have picnics by the river on weekends.

We have a picnic by the river every weekend.

He bought a new jacket.

My room is on top of the building.

This book is the first volume of a trilogy.

We will make a decision after listening to his opinion.

I like to read books at home on rainy days.

Rainy days make me feel down.

The term '地圈' refers to the solid part of the Earth.

He is an expert in oceanography.