An Ingress Protection rating is composed of two digits.

防护等级由两位数字组成。

The robot also has an ingress protection rating of 7, which basically means that it has the second highest level of protection against the intrusion of solid objects, so it is pretty indestructible.

该机器人还具有7级的入口防护等级，这基本上意味着它具有针对固体物体侵入的第二高防护等级，因此它相当坚不可摧。