In chemistry class, I learned about the reactions of acid anhydrides.

In chemistry class, I learned about basic oxides.

Acidic oxides react with water to produce acids.

Aluminum is an amphoteric oxide, it reacts with both acids and bases.

Basic oxides react with acids to produce salt and water.

Essential amino acids cannot be produced in the body, so they need to be obtained from the diet.

He achieved the Big Three Dragons in mahjong.

The monk was meditating in the garden.

Santiago is the capital of Chile.

He prefers to drink third-category beer.