It's actually the mean radiant temperature, which is the heat load on the human body.

它实际上是平均辐射温度，也就是人体承受的热负荷。

So that's the, the total heat load on your body when you're standing on this concrete surface in the middle of the sun.

这就是当你站在阳光下的这个混凝土表面上时你身体的总热负荷。