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- the principal focus system 主聚焦系统
- The British Sedimentological Research Group (BSRG) is the principal focus point for all aspects of sedimentological research in the UK. 英国沉积学研究组（BSRG）是英国最主要的沉积学研究中心。
- My wages are the principal source of my income. 薪金是我收入的主要来源。
- The principal shareholder ask for a meeting. 主要股东们要求召开会议。
- Keys are available on application to the principal. 向校长申请就可得到钥匙。
- She drank in every word of the principal's lecture. 她全神贯注地听校长演讲的字字句句。
- John informed the principal against Paul. 约翰向校长告发了保罗。
- The principal dwelt on traffic safety in his talk. 校长没完没了地谈论交通安全问题。
- The principal reprimand the student for his chronic lateness. 校长斥责那个学生不该接二连三地迟到。
- Experiments in Focus System of the M. 多层光盘调焦系统实验分析。
- Swahili is the principal lingua franca in East Africa. 东非的主要交际语是斯瓦希里语。
- The principal is busy at his desk, you'd better leave him alone. 校长正忙于桌上的工作，你最好别打扰他。
- The Danube is one of the principal rivers of Europe. 多瑙河是欧洲的主要河流之一。
- DSP motive auto focus system and can match with manual adjustment. 动态自动聚焦系统,配合手动聚焦调整;
- Miss Parker sent Joe to the principal's office for giving her a dirty look.. 因为乔瞪了帕克小姐一眼，她便把乔送到校长办公室。
- Focal length The distance between the centre of a lens and its principal focus. 镜头中心与其主焦点的距离。
- I've been to the Principality of Monaco. 我曾去过摩纳哥公国。
- The principal discouraged unexcused absences. 校长不准无故缺课。
- The principal has a very tight schedule. 校长的日程表排得满满的。
- The principal knew all the students individually. 校长认识每个学生。
