What is the posture of the tray in the flight attendant? What tools are there in the stewardess's tray?

The gesture of the tray in flight attendant is to hold the second half of the tray with both hands, the inner edge of the tray with the thumb and the bottom of the tray with the other four fingers. The height of the tray should be above the waist and below the chest, and the tray should be flat and slightly inclined inward. The items placed on the tray should not be too high, but should not exceed the chest. There are all kinds of drinks and some food in the stewardess's tray.