His Japanese ability is improving gradually.

This mutetrahedron plays a very important role in the world of mathematics.

Fumiko wrote him a letter.

This room is six tatami mats in size.

There is a proverb that says, 'Plan your day in the morning and your year on New Year's Day,' which means that you should plan your day in the morning and your year on New Year's Day.

In arid regions, there is little rain, making it difficult for plants to grow.

His movement was very fast.

He exhausted his strength to finish the work.

The committee approved the new project.

Sentarou fell asleep while watching TV.