He built a house using boards.

Every day, I have to climb this steep slope to go to school.

He always keeps in mind the phrase 'If one learns without thinking, it is a waste.'

It is currently summer in the Southern Hemisphere.

We are planning a campaign for the sales promotion of the new product.

Countries located in the Eastern Hemisphere have diverse cultures and histories.

This rock is gabbro.

He was arrested for a minor offense.

This wall is made of a special material that causes diffuse reflection.

This material has the property of diffusely reflecting light.