Coz we don't do that here...

教科书页面截图，讲网络分层协议。一段关于物理层的文字被粉色粗线圈出，写着“The physical layer sends the bits over the physical media. If you want to know about the physical layer, study electrical engineering.”，适合表达无语、嘲讽、甩锅或摸鱼。