circumstance [ circum- = around 周围；st= to stand 立;-ance n. =thing 物=> “things that stands or exists around 周围站立或存在的事物”→]n. surrounding condition 环境，情况 / The place, the weather and other circumstances made the picnic a great success. 地点、天气及其它环境条件使那次野餐大为成功。

circumstantial a. 按照情况的；详细的

circumvent [ circum- = around 绕;vent = to come 来→]v. ① come or go around 围绕，绕行 / He took a roundabout route to circumvent the traffic on the main road. 他走迂回线路绕开干道上的车辆。② get around; outwit 计取；智胜 / It's foolhardy to try to circumvent the police. 跟警方斗法是很鲁莽的。

circumvention n. 围绕；智胜

有时，与circum-结合的词基是个拉丁语源的借词。例如：circumnavigate [ circum-= around ; navigate v. 航行→]v. navigate around (the earth)环航 / Magellan died before he could finish circumnavigating the earth. 麦哲伦环球航行未成身先死。

circumnavigation n. 环航；环球航行