Why doesn't the snow in Beijing Winter Olympics melt?

This kind of artificial snow can realize the independent change of hardness, snow content and diameter. After adding anti-melting agent, it can also ensure that artificial snow will not melt at a certain temperature. But it is this kind of snow, which is beneficial to all winter athletes to set new records and provide security, but it has always been a western patent. When China began to develop funa, even a decent ice and snow runway could not be built. After each breakthrough, western experts come to China to inspect, and they say that they are unqualified when they step on their feet, and they will not provide data or methods for making qualified ice and snow at all.