1. a mechanically operated piano that uses a roll of perforated paper to activate the keys. 
   用滚动的穿孔纸激活键盘的自动演奏的钢琴。
2. Perforated like a sieve. 
   筛状的象筛子那样穿有小孔的
3. a perforated steel plate; perforated cancellation; perforated stamp. 
   穿孔钢板；打孔作废；打孔邮票。
4. Having no opening; not perforated. 
   不开口的，不穿孔的
5. not perforated; having no opening. 
   没有穿孔；没有孔洞。

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