fruitless

1. Our efforts to persuade her proved fruitless.
   我们努力说服她，但毫无成效。
2. His effort to woo her to his side prove fruitless.
   他试图说服她站到自己一边的努力徒劳无功。
3. So far the search for the missing boy has been fruitless.
   到目前为止，还没有找到那失踪的男孩。
4. Their negotiation was fruitless.
   他们的谈判没有结果。
5. His struggle with adversity is fruitless.
   他徒与不幸挣扎而毫无结果。

fruitless splicing specifies male courtship behavior in DrosophilaFruitless specifies sexually dimorphic neural circuitry in the Drosophila brain.Fruitless and doublesex coordinate to generate male-specific neurons that can initiate courtship.Male-specific fruitless specifies the neural substrates of Drosophila courtship behaviour.Necrotizing enterocolitis--150 years of fruitless search for the cause.The Sex-Determination Genes fruitless and doublesex Specify a Neural Substrate Required for Courtship SongExtended reproductive roles of the fruitless gene in Drosophila melanogaster revealed by behavioral analysis of new fru mutants.Aberrant Splicing and Altered Spatial Expression Patterns in fruitless Mutants of Drosophila melanogasterSpatial, temporal, and sexually dimorphic expression patterns of the fruitless gene in the Drosophila central nervous systemSexual orientation in Drosophila is altered by the satori mutation in the sex-determination gene fruitless that encodes a zinc finge...