Oh! Hi, Grandpa. Yes, of course, I am, but my mind isn't.
噢, 嗨, 爷爷。是的, 当然, 我准备好了, 但是有点心事。
People who work in offices are frequently referred to as white-collar workers' for the simple reason that they usually wear a collar and tie to go to work.
坐办公室的之所以常常被称作“白领工人”,就是因为他们通常是穿着硬领白衬衫,系着领带去上班。