肺细胞约每周新老更替一次。Lung cells die and are replaced about once a week.昼夜更替.Day and night alternate.从事高等教育的人员新老更替极其缓慢。There has been very little renewal of personnel in higher education....
Workmen were hired to remodel and enlarge the farm buildings.雇用了工人来改造和扩建农场建筑。In University Square workmen are building a steel fence.在大学广场上，工人们正在修建钢栅栏。The coarseness of her cursing amazed the workmen.她骂人的那些粗话让工人们大吃一惊。...
the Nevada-California state line内华达和加利福尼亚两州州界The film begins with an aerial view of the Great Basin of Nevada.影片以空中鸟瞰内华达大盆地的镜头开始。To her surprise, Kay came to love living in Nevada.恺喜欢住在内华达州,连她自己也感到奇怪....