形容词
中文翻译：Unknown
同义词：
['efficient', 'productive', 'beneficial', 'advantageous']
例句：
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1. This newdrug is effective in treating cancer.
这种新药对治疗癌症有效。
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2. The manager's decision was effective in improving the company's performance.
经理的决定有效地提高了公司的绩效。
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3. The new policy will be effective in reducing traffic congestion.
新的政策将有效减少交通拥堵。