1. The government should take effectual measures to combat unemployment.
    政府应采取有效措施来对付失业问题。

2. Quinine is an effectual preventive for malaria.
    奎宁是有效的疟疾预防药。

1. 奏效的：efficient 有效率的 | effectual 奏效的 | 32) exceptionable 反对的

2. danci.911cha.com

2. 有效的：effect 效力,影响,实现 | effectual 有效的 | effectuate 使实现,实践

3. 多效的：Casual: arbitrary, unplanned, unexpected, 随意的 | Effective: efficient, effectual, fruitful, productive, valid多效的 | Criticize: reproach, blame, 批评

4. 会应验的：会引起反对的exceptionable | 会应验的effectual | 会友membership

1. （行动、计划等）有效的，奏效的
    If an action or plan is effectual, it succeeds in producing the results that were intended.

公共查询·英语单词

    e.g. This is the only effectual way to secure our present and future happiness.
           这是确保我们现在及以后都会幸福的唯一有效途径。