Waterfall model
[计] 瀑布模型
🧩 词语组成解析
🗣️ 情景例句
The sketches for the cover of the new doll book?
是新玩具书的封面设计吗？
He is the wise man who is the honest man.
诚实的人就是聪明的人。
He was on his way to a lecture, when a tourist stopped him and asked him for directions.
他走在去听课的路上，此时一位游客拦住他问路。