[tu-] Tom Cat is [2] inside the [-o] office building lobby where he must 驮 carry by back 大 big office supplies from the elevator to the lobby door for the office workers. One of the 大 big things he must 驮 carry on the back is a 马 horse which for some reason is used by the office workers. The office workers and Jerry are in the corner of the lobby relaxing as Tom literally and figuratively must 驮 carry on the back everything for them.