屡次试验都不错。爽：差错。
屡试不爽 [lǚ shì bù shuǎng]
1. have proved effective every time; As often as it is used, it proves accurate.; effective every time it is used; have stood numerous tests; have the same result or reaction after try; prove successful in every test; put to repeated tests and proved right; repeated tests have shown it to work well屡次试验都不错。
对于新研制的药物，他往往先在自己身上作试验，屡试不爽以后，才敢用于临床。
Time-tested
探究盘口，不得不说的是盘口决不是足球的魔方，也不是屡试不爽(Time-tested)的快刀，它和其他的方法一样，都是有优势也有缺点，没有绝对的神奇人物，也没有一场不堪的点背小子，机会(Opportunity)是80％左右...
Borrowing money
芝麻悦读系列：种瓜得豆 - 图书 - 当当网 ... Unfair treatment区别对待 Borrowing money屡试不爽 I'm not quite mad半疯半傻 ...
tried and true
英文 - 固定短语 ... Home Market - 国内市场，本土市场 Tried and True - 屡试不爽 Across-the-Board - 全面的 ...
time-tested
time-tested
这是一种屡试不爽的手段，同样也被烟草工业广泛采用。
It's a well-trodden technique, also deployed extensively by the tobacco industry.
但屡试不爽的是，每当我唱起《飞越彩虹》，她们就像被敲昏似的睡了过去。
" Without fail, however, they fell asleep as if knocked unconscious every time I sang "Over the Rainbow.
促进出口是一条屡试不爽的避免衰退的途径.不幸的是,当整个世界陷于同时下滑的泥潭时,这条路却并不好走.
Boosting exports is a tried and true way of escaping recession. Unfortunately, it is difficult to do when the entire world is mired in a simultaneous slump.
清·蒲松龄《聊斋志异·冷生》：“言未已，驴已蹶然伏道上，屡试不爽。”
