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BNC: 37086 COCA: 40093
unavailingadjectiveuk/ˌʌn.əˈveɪ.lɪŋ/ us/ˌʌn.əˈveɪ.lɪŋ/ formal or literary

When an attempt to do something is unavailing, it is unsuccessful or has no positive effect.徒劳的,无成果的

Diplomatic efforts at peace-making have so far proved unavailing.调停争端的外交努力到目前为止被证明是徒劳的。
BNC: 37086 COCA: 40093
BNC: 37086 COCA: 40093
BNC: 37086 COCA: 40093
unavailing
Unsuccessful: failed, abortive, fruitless...

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