英语阅读,速求答Learn From MistakesThomas Edison tried two thousand different materials in search of a filament(填充物)for the light bulb.When none worked,his assistant(助手)complained,"All our work is in vain(白费功夫).We have l
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![英语阅读,速求答Learn From MistakesThomas Edison tried two thousand different materials in search of a filament(填充物)for the light bulb.When none worked,his assistant(助手)complained,](/uploads/image/z/7695066-66-6.jpg?t=%E8%8B%B1%E8%AF%AD%E9%98%85%E8%AF%BB%2C%E9%80%9F%E6%B1%82%E7%AD%94Learn+From+MistakesThomas+Edison+tried+two+thousand+different+materials+in+search+of+a+filament%28%E5%A1%AB%E5%85%85%E7%89%A9%EF%BC%89for+the+light+bulb.When+none+worked%2Chis+assistant%28%E5%8A%A9%E6%89%8B%EF%BC%89complained%2C%22All+our+work+is+in+vain%28%E7%99%BD%E8%B4%B9%E5%8A%9F%E5%A4%AB%EF%BC%89.We+have+l)
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