Definition: a gradual process of change and development Level: B2
语言的演变是一个令人着迷的研究领域。
The ___evolution of language is a fascinating area of study.
达芬奇的工作预见了科学和技术的演变。
Leonardo's work foresaw the ___evolution of science and technology.
社会演变是人类历史中的一个关键因素。
Social ___evolution has been a key factor in human history.
