unproductive造句

I've had a very unproductive day.
我這一天什么事都沒干成。

Research workers are well aware that much of their time and effort is unproductive.
研究人員很清楚，他們的很多時間和精力全都是白費。

...increasingly unproductive land.
越來越貧瘠的土地

One quarter of the country is reckoned as unproductive.
該國四分之一的土地被認為是不毛之地.

To prospect for ( oil, for example ) in an area supposed to be unproductive.
盲目開掘在認為資源不足的地區盲目找 ( 如油 )

• #unproductive