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....
Adam stumbles on, leaving a trail of devastation in his wake.亚当蹒跚而行，沿路留下毁坏的痕迹。Adam spent a lot of time in his grandfather's office.亚当经常呆在他祖父的办公室里。Adam jumped from his seat at the girl's cry.女孩儿一哭，亚当立即从座位上跳了起来。...
A test for telepathy with a similar device yielded a negative result.用类似装置对于传心术的试验得到负的结果.We are particularly interested in phenomena such as telepathy and levitation.我们对心灵感应及空中漂浮这样的现象特别有兴趣.Many of us find it very difficu...