这些 <-- 按钮 --> 以及与之关联的下拉菜单仅显示您已访问过的引用历史记录，并允许您在需要时快速跳回这些位置。
如果您想更改当前所在的引用，而该引用不在列表中，请使用下方红色高亮区域中的控件：
Those <-- buttons --> and the dropdowns connected to them only show the HISTORY of references that you have already visited, and allow you to quickly jump back to them if needed.
If you want to change the reference that you're at, and it isn't on the list, then use the controls in the area highlighted in red below:
机器翻译自 English
