No point displaces only within the main section, so there are no main sections.
没有一个点的移动只在主断面内进行,因此这里不存在主断面。
There are particles on whole cross section of nozzle divergent section and this fact shows that there is no"no particles zone"in nozzle divergent section.
喷管扩张段整个截面上都有粒子分布, 说明喷管扩张段中不存在“无粒子区”;
There is no first class and no economy section.
该航班不设头等舱和经济舱。
In the section this week, I'll talk about the section meetings in just a moment, but there's no required section meeting this week.
本周的小组讨论,我花一点时间说说关于小组讨论的事情,本周没有要求的小组讨论
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