unproductive造句

I've had a very unproductive day.
我这一天什么事都没干成。

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。

...increasingly unproductive land.
越来越贫瘠的土地

One quarter of the country is reckoned as unproductive.
该国四分之一的土地被认为是不毛之地.

To prospect for ( oil, for example ) in an area supposed to be unproductive.
盲目开掘在认为资源不足的地区盲目找 ( 如油 )

• #unproductive