lǚ shì bù shuǎng
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  • slput to repeated tests and proved right; effective every time it is used; be proved effective every time it is used

    • xīn shā chóng jì xiào guǒ liáng hǎo lǚ shì bù shuǎng

      杀虫剂效果良好屡试不爽

      This new insecticide has been proved effective every time used.

    • lǚ shì bù shuǎng de fāng fǎ

      屡试不爽方法

      time-tested method

    • zhè ge xiào hua lǚ shì bù shuǎng

      这个笑话屡试不爽

      This joke never fails.