Silicon dioxide is a major component of glass and ceramics.

He was affected by secondary effects.

I learned the meaning of 'ichi ni ten' in the classical Japanese class.

His speech was full of hendiadys expressions, which captivated the listeners.

His actions always have a duality.

My room number is two hundred and five.

He was drawing an icosagon shape.

I found a beautiful twinflower in the park.

These shoes have a double sole and are very durable.

He drew a dodecagon shape.