Ms. Charles learned other mores through careful observation, or trial and error.
Charles女士还通过仔细的观察和不断的尝试学到了许多其它的东西。
They were constructed instead on the basis of experience and observation, often as the result of trial and error.
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.
而是根据经验和观察建造的，经常是不断摸索的产物。
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