2.So far the search for the missing middle-aged woman has been fruitless.
"到目前为止,还没有找到那失踪中年妇女。"
3.After repeated but fruitless demands for payment,he brought a suit against the debtor.
在再三要求支付而毫无结果情况下,他向债务人提出诉讼。
4.The search proved fruitless.
搜寻没有结果。
5.Then, after a few fruitless minutes searching for the plughole, you discover that to drain the water away, the entire devicetips rotates around until its disk is tipping gently forwards.