繁体屢試不爽
拼音lǚ shì bù shuǎng
注音ㄌㄩˇ ㄕˋ ㄅㄨˋ ㄕㄨㄤˇ
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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;