1
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
先理解核心含义，再看它在真实句子里的用法。
有效的；奏效的
Producing the intended result; entirely adequate.
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；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。
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。
The contract was declared effectual after both parties signed.
双方签字后，合同被宣布生效。
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。
Not this
The effectual of the new policy is uncertain.
Use this
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”。
Not this
He is an effectual manager who finishes tasks quickly.
Use this
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”。
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Dictionary facts from ECDICT, WIKTIONARY.