形容词
中文翻译：有效的
同义词：
['practical', 'efficient', 'successful']
例句：
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1. The newpolicy is effective in reducing pollution.
新政策有效减少污染。
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2. The manager's advice was very effective in solving the problem.
经理的建议非常有效地解决了这个问题。
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3. This method is effective for cleaning up oil spills.
这种方法对清理油污非常有效。