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blind alley

noun
🔊/ˌblaɪnd ˈæli/
🔊/ˌblaɪnd ˈæli/
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  1. a way of doing something that seems useful at first, but does not produce useful results, like following a path that suddenly stops行不通的方法；死胡同
    • Progress in science cannot be made without exploring blind alleys.科学的进步离不开盲区。