Question

一成不变[yī chéng bú biàn]1.■immutable and frozen; be immutable; be set in one's ways; changeless; cut and dried; fixed and unchangeable; go into a rut; hard and fast (formula etc,); inflexible; invariable; monotonous; unchangeable; unalterable:Nothing is changeless.一成不变的东西是没有的。Nothing in the world is immutable.世界没有一成不变的东西。