Citrate plays an important role in organic chemistry.

The citric acid cycle plays a crucial role in the energy production of cells.

He started a new quest.

This snake has a very powerful poisonous liquid.

I have been to Thursday Island.

He climbed the mountain carrying a large backpack on his back.

This math problem needs to be solved using negative numbers.

A negative number refers to a number less than zero.

Where is the anode of this battery?

The result of this equation will be a negative value.