Grandma groped at the fresh paint for a moment. Slowly, she figured out our prank. She tried to smile.

奶奶在没干的颜料上摸索了一会儿，慢慢地她发觉这只是个恶作剧。

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By trial and error - trying things, making mistakes, and learning from those mistakes - we have figured out how to make electric light, to paint the ceiling of the Sistine Chapel, to fly.

通过尝试新事物，不断犯错，并吸取教训这种反反复复的实验探索，我们才懂得如何制造电灯，如何制作西斯廷教堂天顶壁画，如何飞行。

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