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- Rapid deactivation of the solid catalyst in these processes necessitates regeneration and recirculation of the solids into the riser section in which the principal reaction is accomplished. 这些过程中，迅速失活的固体催化剂需要在基本反应完成后再生，并在提升管的固体中再循环。
- It may be concluded that principal reactions between the hydrazine fuels and clay are physical absorption and chemical degradation. 肼类燃料在土壤环境中与粘土的作用最强 ,主要存在着物理吸附与化学降解两个方面。
- 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。
- Could I ask for your reaction to this policy? 我能问一下您对这个政策的反应吗？
- 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。
- A reactor is a container for chemical reaction. 反应器是进行化学反应的容器。
- 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。
- I'm displeased at your reaction. 我对你的反应很不满意。
- The central or principal vein of a leaf. 中脉中心的或主要的叶脉
- The forces of reaction made reform difficult. 反动势力给改革造成了困难。
- The principal discouraged unexcused absences. 校长不准无故缺课。
- His reaction on this matter is unexpected. 没料到，他对这件事的反应是这样的。
- 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。
- Our school gave a reception to our new principal. 我们学校为新校长举行了欢迎会。
