effective

adj.

1. 有效的; 生效的
   • These are effective measures.
     这些都是有效的措施。
   • The medicine is effective against cancer.
     这药物治癌有效。
2. 事实上的, 实际的
   • Her brother is the king, but she is the effective ruler.
     她的兄弟是国王, 但她才是实际的主宰者。
3. 给人印象深刻的
   • The book has a very effective closing chapter.
     这本书的结尾一章给人印象极深。