We have been a dominantly right-handed tribe for millenia, so even though I don't know why a paleolithic person would trace his hand or blow pigment on it from a tube, I can easily picture how he did it.
我们从千年前便是主右手的部落， 所以虽然我不知道为什么一个旧石器时代的人会描画他的手， 又或往它上面吹出色素， 我可以很容易的想象出他是怎么做到的。