◎屢試不爽lǚshì-bùshuǎng
[be found officious as often as it is tried;be often tried and often succeeded;effective every time it is used] 每次使用都有效;多次試驗都不錯
這種新農藥效果良好，屢試不爽
更多關于屢試不爽的詞語解釋
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