A shallow dish positioned at the normal water level is connected to the()This enables the blowing down or removal of scum and impurities from the water surface.
Which dish did the writer NOT eat?
平皿(Petri dish)
A shallow dish positioned at the normal water level is connected to the()This enables the blowing down or removal of scum and impurities from the water surface.
The ()(天线)is like a dish.