效应

例句：

1. 1. The new policy will have a significant effect on the economy.
   新政策将对经济产生重大影响。
2. 2. The experiment showed that the treatment had an effect on the disease.
   实验表明这种治疗对疾病有影响。
3. 3. The success of the project depends on the effectiveness of the plan.
   项目的成功取决于计划的有效性。