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.
在图1、2和3中可见的UI是一个画布容器，它们包含3 个用户界面元素：表和两个菜单按钮。
The UI visible in Figures 1, 2, and 3 is a canvas container that holds three user interface components: the table and two menu buttons.
在图1、2和3中可见的UI是一个画布容器，它们包含3 个用户界面元素：表和两个菜单按钮。
The UI visible in Figures 1, 2, and 3 is a canvas container that holds three user interface components: the table and two menu buttons.
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