1. 屢試不爽 (lǚshì-bùshuǎng)

   1. 每次使用都有效;多次試驗都不錯 be found officious as often as it is tried;be often tried and often succeeded;effective every time it is used
      • 這種新農藥效果良好,屢試不爽

屢試不爽是成語。

屢試不爽 (lǚ shì bù shuǎng)

1. 屢次試驗，結果都相同。