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1. The printing wheel is the heart of the printing press.
印刷滚筒是印刷机的核心部件。
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2. The printer used a new type of printing wheel to improve its efficiency.
打印机使用了一种新型的印刷滚筒来提高其效率。
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3. The old printing wheel was worn out and needed to be replaced.
旧的印刷滚筒磨损严重，需要更换。