We spread phosphate fertiliser on the field.

The era of the Three Sovereigns and Five Emperors is an important period in Chinese history.

He is collecting centime, the old currency of France.

I want to go to Saint Barthélemy.

Essential amino acids, which the human body cannot produce on its own, need to be obtained from the diet.

Essential amino acids are necessary to be taken from our diet because our body cannot produce them on its own.

He finally passed the exam, proving that the third time's a charm.

Please calculate the area of this right triangle.

This ring is made of alexandrite.

Hydrocyanic acid is a very dangerous chemical.