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BNC: 14719 COCA: 17328

C1 not producing very much收益很少的;效果不明显的

Opposite

C1 not having positive results徒然的;无效的

It was such an unproductive meeting - we didn't make a single decision.这是场徒劳无功的会议——我们连一项决议也没有做出。
BNC: 14719 COCA: 17328
BNC: 14719 COCA: 17328
unproductive adj.
ineffective
BNC: 14719 COCA: 17328
unproductive
Unsuccessful: failed, abortive, fruitless...
Crop farming: arable, broadacre, cash crop...
Soil fertility and fertilization: compost, compost, desertification...

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