The menu will expand to show four preset positions and preset 1 will automatically be highlighted.
此菜单会展开显示四个预置位置，预置1将自动变高亮。
Default TAB stops are the preset positions to which you can align text by repeatedly pressing the TAB key.
默认制表位是预设位置，通过重复按Tab键可将文本与之对齐。
The laser points are monitored by build-in CCD, and directed to preset positions by conjugate light paths.
通过内置面阵CCD来监测激光光点位置，并利用共轭光路法引导光束到预定位置。
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