“惰”乃“懒、懈怠”也．惰性是人的一种不良行为习性和性情习惯．自从有了“惰”字之后，它一般地都用在人──这个万物之灵的身上，用来表示人的行为特性．然而惰字用在无生命物体乃至万物身上，从物理的角度看也不能说是用词不当，因为任何物体在运动性质上都能体现它的惰 “Indifferent” is “lazy, lazy” also. Inertia is a person’s habit of bad habits and temperament. Since the word “inert” was used, it was generally used on people-the spirit of all things, to express human behavior. However, the use of inert characters in inanimate objects and even all things cannot be said to be improper in terms of physics, because any object can manifest its inertia in its nature of movement.