1. A space relatively empty of matter. 
   相对真空
2. With little or no space between; dense; compact 
   中间无空隙的；浓缩的；挤紧的
3. relatively small compact tawny-brown heron with nocturnal habits and a booming cry; found in marshes. 
   相对较小的茶棕色鹭，夜间活动、叫声轰然作响；常见于沼泽地带。
4. any of numerous chiefly shorebirds of relatively compact build having straight bills and large pointed wings; closely related to the sandpipers. 
   主要是骨格比较紧凑的滨鸟，直嘴，翅膀大而尖；与矶鹞有亲缘关系。
5. Each minute of music on a compact disc needs approximately 10M bytes of storage space and takes a bit less than an hour to download via 28.8K bit/sec. modem. 
   光盘上每分钟的音乐大约需要10兆字节的存储空间，通过28.8k位/秒的调制解调器下载要花一小时不到一点的时间。

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• 1. 相对紧空间
  条件紧集,相对紧集 relatively compact space...相对紧空间 relatively countably compact subset...相对可数紧子集 relatively weakly compact set
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