Yu helped me with my homework.

The season of spring has come.

He shook his head up and down and left and right.

He lives with the spirit of 'I alone am the honored one under heaven and on earth.'

A song praising his courage was playing.

He assisted my project.

The petals scattered in the wind.

This is a model of a mutetrahedron.

This mutetrahedron has a very unusual shape.