Whenever he fails, he always sulks.

Essential amino acids cannot be produced in the body, so they 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.

This is my first question.

He thinks that war is a necessary evil.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

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

The one-eyed goblin was dancing in the forest.