cardboard tube
... 雪茄烟用套环 cigar bands 硬纸管 cardbord tubes 纸制声管 paper made tone pipe ...
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... 硬纸套筒：card bushing 硬纸管：card tube 硬仗：hard kill ...
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硬纸套管 cardboard bushing
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一旦你完成了课本展示的内容，你就会扔掉这些烟斗通条、吸管和硬纸管。
Once you are done demonstrating whatever concept was in the textbook, you throw away the pipe cleaners, the straws, the cardboard tubes.
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