effectual

adj.

奏效的，收效的；行之有效；

1. Quinine is an effectual preventive for malaria.
   奎宁是有效的疟疾预防药。
2. The government hasn't worked out the effectual measures to combat unemployment.
   政府还没有找出对付失业的有效措施。
3. The practice has shown that the monitoring system is effectual.
   实践表明,该监督控制系统是行之有效的。
4. He felt his way to effectual practice through a multitude of trials and misconceptions.
   经过多次尝试和误解,他在实践中摸索前进。

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