1. He is the principal of this school.
   他是该学校的校长。
2. A spitball hit the principal on his nose.
   一个纸团飞过来打在校长的鼻子上。
3. Their school gave a reception to their new principal.
   他们学校为新校长举办了一个招待会。
4. Drinking is a principal cause of highway deaths.
   酗酒是公路死亡事故的最主要的原因。
5. The teacher conferred with the principal about Dick's promotion.
   教师与校长商谈了迪克的升级问题。
6. The principal spoke with disapproval of your words and actions.
   校长谈到你的言行时很不赞成。
7. There was no school play because the principal withheld his consent.
   由于校长没同意, 学校里没有举行比赛。
8. The two principal political parties have combined to form a government.
   两个主要政党已经联合起来组成政府。
9. The principal issues in dispute concern the duration of the future treaty.
   有争议的主要问题牵涉到将来条约的期限。
10. "Once the principal contradiction is grasped, all problems will be readily solved."
    "一旦抓住了主要矛盾,一切问题就迎刃而解。"
11. Hydrous desmocollinite and exinite in coal are the principal material for hydrocarbon generation.
    另外，本文提出了煤的有机地化参数类比系数法，并对煤生烃潜力进行了评价。
12. He is one of the principal movers and shakers in the political arena.
    他是政界一个有权有势的人物。
13. There is a shortage of principal.
    资金有些短缺。
14. The judge examined the principal witness.
    法官询问了主要证人。
15. The reaction principal, reaction procedure and flowsheeting in the potassium sulfate method are included.
    给出了甲酸钠法的反应原理、反应过程以及工艺流程。对原料消耗、产品规格及质量测定作了简单介绍。
16. Methazolamide eye drops was prepared using inorganic nanoparticles as carrier and methazolamide as principal agent.
    制备醋甲唑胺滴眼液并建立其质量控制方法。
17. An auxotroph requires, in addition to the principal carbon source, one or more organic nutrients.
    缺陷营养生物除需要主要碳源外，还需要一种或几种有机养料。
18. A Deployer maps roles to security identities (for example principals, and groups) in the operational environment.
    配置信息映射角色到操作环境中的安全特征（比如负责人和团体）。
19. The day before my graduation from Soldan High School in St.Louis, the principal called an assembly.
    "我们从St Louis的Soldan高中毕业的前一天，校长召集我们集中。
20. Burma (Myanmar) and Guatemala are the principal sources of modern gem jadeitite, and Canada of modern lapidary nephrite.
    缅甸和危地马拉是现代翡翠的主要产地，而加拿大是现代宝石的主要产地。

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