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An incandescent bulb and fiber were used to collimate light into this speedometer indicator.
白炽灯泡和光纤利用使光平行打入到里程计指标.
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An incandescent bulb and fiber were used to collimate light into this speedometer indicator.
白炽灯泡和光纤利用使光平行打入到里程计指标.
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