unavailing造句

Efforts to reach the people named in the report proved unavailing.
联系过报告中所提到的那些人，但都徒劳无功。

Their efforts were unavailing.
他们的努力都付诸东流。

Hurstwood heard the details of the weary and unavailing search that evening.
那天晚上,赫斯渥听到了这次劳而无获的寻找的详细情况.