1. pyrimidine and purine bases 
   嘧啶和嘌呤碱基
2. Colombian tree; source of Cartagena bark (a cinchona bark). 
   哥伦比亚树种；卡塔赫那的金鸡纳树种。
3. The bases are loaded. 
   满垒了。
4. production bases of building industry 
   建筑生产基地
5. An alkaloid, C19H22N2O, derived from the bark of various cinchona trees and used as an antimalarial agent. 
   金鸡纳宁，辛可宁一种生物碱，c19h22n2o，由金鸡纳树的树皮中制得，用作抗疟疾剂

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