You know, someone sitting next to you in a seat -- that's OK because you're in a theater, but if you were sitting on a park bench and someone came up and sat that close to you, you'd freak out.
比方说，某个人坐在你身边 －－ 这个可以，因为你在剧院， 但如果你坐在公园的凳子上，有个人过来坐在你旁边， 你就会焦虑不安。