55℃ is the most suitable temperature for drinking
1. Poured 100 degree boiling water poured into the cup, shaking at less than 1 minutes, the water temperature suddenly become 55 ℃ . and it can keep the temperature for 3 hours.
2. Poured some cold water into this cup, shaking, the cold water will become 55 ℃ water
Now, you can drink water immediately, even it is boiling just now.