1. The pentad of earth, air, fire, water, and ether is a common concept in many ancient philosophies.
土、空气、火、水和以太的五元素概念在许多古代哲学中都很常见。
2. The five fingers of the hand form a pentad that allows us to grasp and manipulate objects.
手的五个手指形成了一个能让我们抓握和操控物体的五部分组合。