Silicon dioxide is a major component of glass and ceramics.

She took a pose where her legs formed an M-shape.

The great icosihemidodecahedron is a cube with a very complex shape.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He said, 'Misery of life starts at literacy,' and spoke about the hardships of learning.

I am learning Simplified Chinese.

I have started learning Traditional Chinese.

In behavioral sciences, the use of metatools plays a crucial role.

I will hold my birthday party on the twenty-seventh day of the month.

We have our wedding on the twenty-ninth day of the month.