So talking to you now, I'm sitting upright in a chair, I'm not falling to the ground and that's actually requiring quite a lot of postural control which is occurring in my brain.

此刻我跟你说话，我正直挺挺地坐在椅子上，我没有掉到地上，这其实需要相当多的姿势控制运作，而这正在我的大脑中发生。