形容词
中文翻译：有效的
同义词：
['efficacious', 'efficient', 'effective', 'fruitful']
例句：
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1. The new policy is expected to be effective in reducing pollution.
新政策预计将有效减少污染。
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2. The medicine is effective against the common cold.
这种药对普通感冒有效。
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3. The manager's suggestion was effective in solving the problem.
经理的建议在解决问题上是有效的。