optical aid

       
  • 视觉辅助器,光学辅助工具

optical aid的用法和样例:

例句

  1. Given the surviving records for all manner of other optical systems and mechanical drawing aids, the absence of evidence for the Hockney projector is difficult to explain.
    其他光学系统与绘图辅助工具的记录,到今天都还留存了不少,为何唯独缺乏霍克尼投影设备的证据,显然很难解释。
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