查词历史：
- unproductive unpretentiously
1.
ADJ-GRADED
没有好结果的；徒然的 Something that is unproductive does not produce any good results.
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Research workers are well aware that much of their time and effort is unproductive.
研究人员很清楚，他们的很多时间和精力全都是白费。
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...increasingly unproductive land.
越来越贫瘠的土地
- Adjective
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1. not producing or capable of producing;
- "elimination of high-cost or unproductive industries"
- antonym： productive
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2. not producing desired results;
- "the talks between labor and management were unproductive"
