barren efforts

• 无效的努力

barren efforts的用法和样例：

例句

1. Unfortunately, some sales reps stay with those dry areas, holding on, hoping something will come as a result of their futile efforts.
   不幸的是，有些销售员一直呆在干涸的地方，坚持，希望他们的无效的努力会得到一些结果。