By default,If you hover a file/folder and right click mouse,you will only see a  option Trash on pop-up menu for removing function.How to add a  option Delete on it so that we can delete file/folder bypasses Trash? It is very easy,just go to Nautilus->Edit ->Preferences->Behavior and tick the option"Include a Delete command that bypasses Tras" which is on the most bottom,and then you may see  option Delete already added to the pop-up menu.