effectual
adj. 奏效的；会应验的；有法律效力的
例句
This is the only effectual way to secure our present and future happiness.
这是确保我们现在和未来幸福的唯一有效途径。
《柯林斯英汉双解大词典》
Quinine is an effectual preventive for malaria.
奎宁是有效的疟疾预防药。
Opting for organic foods is an effectual choice for personal and planetary health.
选择有机食品对个人和全球的健康均有效。
