形容词
中文翻译：非生产的
同义词：
['unproductive', 'ineffective', "futile例句：1. The company's decision to invest in new technology was nonproductive.（公司决定投资新技术的决定是无效的。）"]
例句：
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1. The company's decision to invest in new technology was nonproductive.
公司决定投资新技术的决定是无效的。
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2.The research was unproductive, as it did not yield any significant results.
这项研究是无效的，因为它没有产生任何显著的结果。
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3. The farmer's efforts were futile; the weather conditions were against them.
农民的努力是徒劳的；天气条件对他们不利。