hello i'm an vietnamese student, i've read this new: https://roboticsandautomationnews.com/2020/03/12/farewell-to-the-old-assembly-line-automation-is-changing-manufacturing-… , in the passage: "Numerous exhibitors will present alternatives to conventional assembly line production with stationary conveyor technology, for example driverless transport systems and, of course, cobots for human-robot collaboration applications. ", i was wondering, what is 'stationary conveyor technology' ? and is this the fact that it includes driverless transport systems-cause it seems not 'stationary' at all. Please help me!