作业用安全栏(6)设置于上梁(2)。
A safe gird (6) for operation is arranged on the upper beam (2).
查看侧栏使用J2EE servlet了解实现这种安全场景的有趣方法。
See the Using a J2EE servlet sidebar for an interesting approach to this security situation.
你可以在右上角的“安全”按钮里选择这个选项；如果你已经选择让菜单栏变成可见的，你也可以通过选择菜单栏中的“工具”菜单选定。
You turn it on by either selecting that option from the Safety button at the upper right, or from the Tools menu in the Menu Bar if you have chosen to make that bar visible.
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