html css菜单无法正常工作

Hi I have a menu and I include this in every page. In this page, the book & allocate menu bar is working properly when I move my mouse over it but search and add menu bar not working properly. when I move the mouse over the menu bar it doesnt show the submenu but when I mover the mouse over text it shows the submenu and when I try to go to submenu it disappears. Hi I have a menu and I include this in every pa