1. You can try the speed and effect of boiling water in the supermarket and the size of the water. In JD.COM, you can only look at pictures, but you can't see the real thing and you can't test it.

You can buy it in the supermarket at once. If you are in a hurry, you don't have to wait, but in JD.COM, you have to wait for the express delivery, which is a waste of time.