Now at version 5, Preview has undergone numerous improvements over time, but its Annotations toolbar, easy selection of columns, and image editing capabilities emphasize its advantage for users.
目前版本5的预览，随着时间的推移虽经历了无数次改进，但它的注释工具栏、专栏的简易选取以及图像编辑能力强调了作为其使用者的优点。
Toolbar controls should become disabled if they are not applicable to the current selection.
如果不能用于当前选择，工具栏控件应该被禁用，它们一定不能提供模棱两可的状态。
When you use a selection tool, the Transparent Background and Opaque Background options appear in the option selector on the Image Editor toolbar (as seen below).
当使用选择工具时，“透明背景”和“不透明背景”选项出现在“图像编辑器”工具栏上的“选项”选择器中(如下所示)。
When you use a selection tool, the Transparent Background and Opaque Background options appear in the option selector on the Image Editor toolbar (as seen below).
当使用选择工具时，“透明背景”和“不透明背景”选项出现在“图像编辑器”工具栏上的“选项”选择器中(如下所示)。
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