形容词
中文翻译：有效的
同义词：
['efficient', 'productive', 'beneficial', 'advantageous']
例句：
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1. The new policy is expected to be effective in reducing pollution.
预计新政策能有效减少污染。
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2. This medicine is effective for treating headaches.
这种药对治疗头痛有效。
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3. The new manager has been effective in improving the company's performance.
新任经理在提高公司业绩方面非常有效。