show scroll bars

例句：

1. 1.When you open a document in Microsoft Word, the scroll bars appear on the screen.
   当你在Microsoft Word中打开一个文档时，屏幕上会出现滚动条。
2. 2. The user can use the scroll bar to navigate through the text.
   用户可以使用滚动条来浏览文本。
3. 3.To view more content, you can drag the scroll bar to the right.
   要查看更多内容，你可以拖动滚动条向右。