单词：optical aid
optical aid的用法和样例：
例句
- 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。
单词：optical aid 相关文章
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