演变 evolvement outcome 同义词 演化 蜕变 例句 A gradual process in which something changes into a different and usually more complex or better form. 演变,演化,展开一事物演变成另一种更复杂、更好状态事物的逐渐转变过程 soil evolution 土壤演变 river channel process 河床演变 estuary channel process 河口河床演变 evolution of reservoir banks 水库库岸演变