Their search for the plane is fruitless.

他们对飞机的搜寻结果的。

After repeated but fruitless demands for payment,he brought a suit against the debtor.

在再三要求支付而结果的情况下,他向债务人提出诉讼。

Our first experiment was a blind alley, but the second one gave us very promising results.

我们的第一试验结果，不过第二试验取得了十分可喜的结果。

This is a barren argument.

这一场结果的争。