This compound has a tetrahedral molecular geometry.

The Koizumi Shinjiro structure brought a new wind to Japanese politics.

This problem is difficult.

What does this sentence mean?

Humanities is an academic field that studies human culture and society.

He is my best companion.

I enjoyed a fun time at the amusement park with my family over the weekend.

There are many small cavities in this tree.

The shrine is a traditional Japanese building.

Every year, Mitsugu sent a tribute to the king.