⒈  每次使用都有效；多次试验都不错。

例这种新农药效果良好，屡试不爽。

英be found officious as often as it is tried; be often tried and often succeeded; effective every time it is used;

国语辞典屡试不爽[ lǚ shì bù shuǎng ]

⒈  屡次试验，结果都相同。

例如：「这个方法十分有效，屡试不爽。」

屡,试,不,爽