您要查找的是不是：
- principal synoptic observation 基本天气观测
- intermediate synoptic observation 辅助天气观测
- intermeditate synoptic observation 辅助天气观测
- 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。
- The agent spoke on behalf of his principal. 代理人代表他的委托人说话。
- Keys are available on application to the principal. 向校长申请就可得到钥匙。
- She's been downgraded (from principal) to deputy. 她已(从校长)降为副校长。
- Our principal problem is lack of time. 我们的主要问题就是缺少时间。
- 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 central or principal vein of a leaf. 中脉中心的或主要的叶脉
- He was taken into hospital for observation. 他被送进医院观察。
- The principal discouraged unexcused absences. 校长不准无故缺课。
- Careful observation convinced them that is was so. 仔细的观察使他们相信情况是这样的。
- Rubber is the country's principal export. 橡胶制品是该国主要的出口产品。
- The principal has a very tight schedule. 校长的日程表排得满满的。
- It's basically wrong to have observation taken off from hearsay. 以道听途说作为意见的根据是根本错误的。
- Our school gave a reception to our new principal. 我们学校为新校长举行了欢迎会。
- The principal knew all the students individually. 校长认识每个学生。
