How much does the stewardess need to take to pass the water cup?

The stewardess has to take a third of the water glass. According to the relevant information, the flight attendant should hold the cup handle with one hand (the cup without handle should be held in the lower third of the cup) and gently hold the bottom of the cup with the other hand. When handing something, he should stand at a 45-degree angle with the passenger's front and hand it with both hands. Wait until the other party is firmly connected, then let go.