We worked all day, without any result.
我们工作了一整天，但毫无结果。
Twenty minutes passed without any result.
20分钟过去了仍无结果。
I had been puzzling over the problem for over an hour without any result, when suddenly solution flashed across my mind.
这个问题把我难住了一个多小时，后来我突然开窍了，找到了答案。(时间状语从句)。
I had been puzzling over the problem for over an hour without any result, when suddenly solution flashed across my mind.
这个问题把我难住了一个多小时，后来我突然开窍了，找到了答案。(时间状语从句)。
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