手性也称为不对称性,它是自然界的基本属性之一。比较左手和右手,二者之间的相互关系相当于实物和镜影之间的关系,但又不能完全重合。这种实物和镜影不能完全重合的性质就是手性,而具有手性的物质就称为手性物质。作为自然界的基本属性,手性是普遍存在的,不但宏观世界的物质普遍存在手性,从微观角度来看,很多物质的分子也具有两种不同的形态,象左手和右手一样,具有 Chirality, also known as asymmetry, is one of the basic attributes of nature. Comparison of left hand and right hand, the relationship between the two is equivalent to the relationship between the physical and mirror shadow, but can not completely coincide. The physical and mirror shadow can not completely coincide with the nature of the chiral, while the chiral substance is called the chiral material. As the basic attribute of nature, chirality is ubiquitous. Not only the universality of the material in the macroscopic world is chiral, but from the microscopic point of view, many material molecules also have two different forms, like the left hand and the right hand,