作了几十次实验，无一成功。
在接下来的几个星期里，这个实验重复了几十次。
This experiment was repeated several dozen times over the next few weeks.
而且过去一段日子里我每天都得干上好几十次这样的事。
And I've done that at least a dozen times the past couple days.
在此之前，他已经跑过几十次马拉松了，所以他应该不算是初学者。
He had run a few dozen marathons before, so he was hardly a beginner.
在此之前，他已经跑过几十次马拉松了，所以他应该不算是初学者。
He had run a few dozen marathons before, so he was hardly a beginner.
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