A change or variation occurring in the course of something.

变化；变迁。

Interchange or alternation as of states or things.

轮换；交替。

Successive, alternating, or changing phases or conditions, as of life or fortunes; ups and downs.

生命或命运的一连串变迁；沧海桑田；盛衰荣枯。

Change; mutation or mutability.

蜕变；转变；不定性。