effectual in doing sth
表示在某事上有效，后接动名词。
The new policy was effectual in reducing pollution.
新政策在减少污染方面是有效的。
有效的；奏效的
有效的；产生预期效果的；有效果的；会应验的；有法律效力的
有效的；产生预期效果的
Producing the intended result; entirely adequate.
The new policy proved effectual in reducing traffic congestion.
新政策在减少交通拥堵方面证明是有效的。
用法提示：effectual 作为形容词，意为“有效的”，在此句中修饰政策的效果。
Her effectual arguments convinced the committee to approve the proposal.
她有效的论点说服委员会批准了该提案。
用法提示：effectual 修饰 arguments，表示论点具有说服力、产生预期效果。
The contract was declared effectual after both parties signed.
双方签字后，合同被宣布生效。
用法提示：effectual 表示“有法律效力的”，在此句中用于法律语境。
表示在某事上有效，后接动名词。
The new policy was effectual in reducing pollution.
新政策在减少污染方面是有效的。
表示对某事有效，后接名词或动名词。
This medicine is effectual for treating headaches.
这种药对治疗头痛有效。
表示对抗某事有效，常用于药物或措施。
The vaccine is effectual against the virus.
这种疫苗对该病毒有效。
grammar · medium
易错句子The effectual of the new policy is uncertain.
正确表达The effectiveness of the new policy is uncertain.
“effectual” 是形容词，不能直接作名词。应使用名词形式 “effectiveness”。
grammar · medium
易错句子He is an effectual manager who finishes tasks quickly.
正确表达He is an efficient manager who finishes tasks quickly.
“effectual” 强调达到预期效果，而 “efficient” 强调以最少资源完成任务。此处应使用 “efficient”。
effective 强调实际达到预期效果，而 effectual 强调具备产生效果的能力或法律效力。
efficient 侧重于以最小浪费完成任务，effectual 侧重于实现预期结果。
efficacious 多指药物或治疗有特效，effectual 更通用，也可指法律效力。
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