英文构词法 —— circum- 前缀 1. - circum-:表示环绕,周围,圆周; circle:圆;循环; circumference:圆周,周长,胸围; circumstance:环境; circumnavigation:环球航行; circumnavigate the world /globe circumvent:v. 包围;智取;绕行,规避 get around