long shot
noun [ C usually singular ] uk/ˈlɒŋ ˌʃɒt/ us/ˈlɑːŋ ˌʃɑːt/
希望不大的尝试
something you try although it is unlikely to be successful
It's a long shot, but you could try phoning him at home. 尽管希望不大，你也可以试着给他家里打个电话。
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