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unavailing [英] [ʌnəˈveɪlɪŋ] [美] [ˌʌnəˈvelɪŋ] [形] 无效的;无益的;徒劳的 词频排名 37223/55435 学习人数 2238 难度等级 10/10 认知比例 20.14% 例句 "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。 "All of his efforts, however, proved unavailing." 然而,他所有的努力都无济于事。 助记 联想 GRE 无效的,徒劳的,无果的 un available avail 效用,利益
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