单词：retrograde vernier
逆游标,反读游标
retrograde vernier的用法和样例：
例句
- Any program that demands precise alignment must offer a vernier.任何要求精确对齐的程序必须提供精确滚动的游标工具。
- The depth vernier gauges can be used to measure depth and step.深度游标卡尺用于测量深度，台阶等。
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