1. either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration. 
   相交在一台光学仪器焦距平面的两条相互垂直的直线中的任何一条，用来瞄准或者校准。
2. calibration of celestial radio radiation 
   天体射电的定标
3. Punched tape, punch tape 
   穿孔纸带
4. The Standards and Calibration Laboratory holds the official reference standards of measurement for Hong Kong and provides calibration services in various measurement areas. 
   标准及校正实验所负责保存香港的各项正式计量基准，并提供多类测量校正服务。
5. In focus; out of focus. 
   清晰；不清晰

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• 1. 焦距校正带
  float-actuated tape 浮筒动作测深度表尺...focus calibration tape 焦距校正带...formatted tape 格式编排磁带
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