effective incidence

例句：

1. 1. Thenew policy is expected to be effective inreducing pollution.
   新政策预计将有效减少污染。
2. 2.The medicine is effective for treating the commoncold.
   这种药对治疗普通感冒有效。
3. 3.The manager's suggestion was effective insolving the problem.
   经理的建议在解决这个问题上是有效的。