前门上响起一阵刺耳的金属敲击声。

A sharp metallic rapping came on the front door.

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我转过身，看见戴维斯从走道上迎面而来，他自制的义肢踩在地面上，发出金属敲击瓷砖的声响。

I turn to see Davis walking down the hall, his self-made peg leg clacking, steel on tile.

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他发现金属敲击的声音可以富有人性化，为此他欣喜欢悦，而人性化的声音又能进而加工成类似鸭的叫声。

He was delighted to find that metallic sounds could become human voices, and that human voices could be made to quack like a duck.

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