Because in other places, you can have interruptions like the TV, or you could go for a walk, or there's a fridge downstairs, or you've got your own couch, or whatever you want to do.
因为其他地方，会有干扰， 比如会跑去看电视 或者是散个步， 到楼下冰箱拿个东西， 或者你赖在自己的沙发上，想要什么就有什么。