It was not until several years later, when Alexander Graham Bell mastered the technique of making recordings in wax, that the Phonograph became more than a toy.

直到几年后，亚历山大·贝尔掌握了蜡质录音技术，留声机才变得不再是玩具。

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This technique has allowed Graham to raise the alarm early and often about potentially dangerous drugs.

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Graham was driven to create technique that communicated power and emotion.

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