英语翻译Oncethey'vebeenteachingforthreeyears,andjudgedsatisfactoryinaprocessthatinvariablyjudgesallbutafewofthemsatisfactory,theyareensuredlifetimeventure.不能理解afewofthemsatisfactory是指他们少数的令人

Question

英语翻译
Once they've been teaching for three years,and judged satisfactory in a process that invariably judges all but a few of them satisfactory,they are ensured lifetime venture.
不能理解a few of them satisfactory是指他们少数的令人满意之处,还是指仅有少数满意的人.
invariably judges all but a few of them satisfactory,they are ensured lifetime venture应该怎么翻译.

Answer 1

译文：
一旦他们教学已满三年,并且在只有极少人才能被判定为满意的审核中令人满意,那么他们就会得到终生事业.
备注：
1 all but 除了…之外（都...）
2 judge a few of them satisfactory 是指仅有少数人令人满意
3 venture疑为tenure之误