每周五个上午里，老师们会与25人一组的学生见面，就从家庭作业问题到周六晚上糟糕的约会等各种问题展开开放式讨论。
Teachers meet with students in groups of 25, five mornings a week, for open-ended discussions of everything from homework problems to bad Saturday-night dates.
因此50人的项目应该在五个十人一组的组中进行调查。
So a project of 50 people should hold surveys in five groups of ten.
19世纪三十年代，英国的库克和惠斯通开发了电报系统。该系统有五个磁针，通电后，可以指出一组字母和数字。
In the 1830s, the British team of Cooke and Wheatstone developed a telegraph system with five magnetic needles that could be pointed around a panel of letters and Numbers by using an electric current.
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