1. large genus of perennial hairy herbs of Europe to western Asia to northwestern Africa and North America; few are ornamental; often considered congeneric with Pilosella. 
   一个多毛的多年生草本植物大属，分布于西亚至非洲西北部和北美；个别为观赏植物。
2. adverse reactions to drug 
   药物不良反应
3. rational administration of drug 
   合理用药
4. a drug that augments the activity of another drug. 
   增大其他药物疗效的药物。
5. A habitual drug user. 
   经常服用毒品的人

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