形容词
中文翻译：有效的
同义词：
['efficient', 'efficient', 'effective', 'efficacious', 'efficaciously']
例句：
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1.The new policy is expected to be effectivein reducing pollution.
新政策预计将有效减少污染。
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2. The medicine is effective for treating thecommon cold.
这种药对治疗普通感冒有效。
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3. The manager's decision was effectiveimmediately after he made it.
经理的决定在宣布后立即生效。