"那些早期的工匠通过反复试验发现：在压力作用下，宝塔松散堆叠的楼层可以彼此独立地来回滑动。
What those early craftsmen had found by trial and error was that under pressure a pagoda's loose stack of floors could be made to slither to and fro independent of one another.
有些试验发现其益处，而其他的却没有发现。
试验发现圣约翰草在治疗重度抑郁症上并不比安慰剂有效。
The trial found that St. John's wort was no more effective than the placebo in treating major depression.29
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