我认为，这需要在实践中不断摸索，不能纸上谈兵。
I think this needs to fumble ceaselessly in practice cannot be an armchair strategist.
而是根据经验和观察建造的，经常是不断摸索的产物。
They were constructed instead on the basis of experience and observation, often as the result of trial and error.
工程师们在选用其他颜色是采用了反复试验、不断摸索的方法。
Engineers used the trial and error method in selecting the other colors.
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