您要查找的是不是：
- Whether the principal vector in the reduction of a force system can be taken as a force? 关于力系简化中主矢是不是力的讨论?
- Principal vector can not be defined as a force 主矢不能定义为力
- 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。
- feeds on dusky-footed woodrat and bites humans; principal vector for Lyme disease in western United States especially northern California. 以黑腿林鼠的血为食并咬人；美国西部特别是加利福尼亚北部莱姆关节炎螺旋菌主要的携菌体。
- 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。
- feeds on dusky-footed woodrat and bites humans; principal vector for Lyme disease in western United States especially northern California 以黑腿林鼠的血为食并咬人；美国西部特别是加利福尼亚北部莱姆关节炎螺旋菌主要的携菌体
- 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
- The principal discouraged unexcused absences. 校长不准无故缺课。
- 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。
- 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。
- Drinking is a principal cause of traffic accidents. 酗酒是交通事故的主要原因。
- The school principal read the honor roll list. 校长宣读优秀生名单。
