许多药物都是经过反复试验后才被发现的。
从某种意义上说，我们是通过反复试验、不断犯错来学习的。
"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.
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