This chemical synthesis reaction is very complex.

This substance chemically transforms when heat is applied.

He added sugar to his coffee.

He is an excellent pianist, besides, he is also an excellent composer.

What is this material made of?

He missed school because he had a fever.

He is heating up the coffee.

He painted the sun into the landscape.

The heat is intense today, it's hard to go outside.

His passion for music is incredible.