古代哲学家认为世界由四大基本元素组成：土、气、火、水。

Ancient philosophers believed the world was composed of four ___elemental substances: earth, air, fire, and water.

诚实是人类最基本的品质之一。

Honesty is one of the ___essential qualities of human nature.

暴风雨展现出大自然原始而不可阻挡的力量。

The storm showed the ___elemental power of nature, wild and unstoppable.