单词：unfruitful
unfruitful的用法和样例：
例句
- After a period of unfruitful time waiting for a kidney, the poor girl died.该女生在医院里等待肾脏捐赠无果后死亡。
- They have been unfruitful in their efforts.他们都徒劳而归。
- This kind of video does not have commercial value, unfruitful raise bandwidth cost.这类视频没有商业价值，又徒然增加带宽成本。
- fruitless不成功的
- sterile贫瘠的
- unsuccessful不成功的
- unprofitable没有利润的
- unproductive不生产的
- unrewarding无报酬的
- vain自负的
- infertile贫瘠的
- barren贫瘠的
- bare赤裸的
- childless无儿女的
- fruitful多产的
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