那些 <-- 按鈕 --> 以及與之相連的下拉選單，只會顯示您已經造訪過的參考「歷史記錄」，並讓您在需要時能快速跳回這些位置。
如果您想變更目前的參考位置，且該位置不在列表中，請使用下方紅框標示區域中的控制項：
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:
機器翻譯自 English
