unavailing的意思？

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...

unavailing的音标：unavailing的英式发音音标为：[ˌʌnə'veɪlɪŋ]unavailing的美式发音音标为：[ˌʌnə'velɪŋ]...