Measure pickup points diagonally using a beam compass or an electronic measuring system and compare the symmetry.
使用长腿圆规或电子测量系统测量各对角的抬起点，然后比较其是否对称。
An optical disk apparatus records information by irradiating a laser beam from a pickup onto an optical disk.
一种光盘装置，通过将来自拾取器的激光束照射在光盘上记录信息。
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