수능특강 1강 5번입니다.

however, the saying implies that you can never teach any older person anything new, which is a hasty generalisation and one which is fairly obvioisly false.

여기서 첫번째 which와 두번째 which에 대해 어떻게 쓰였는지 가르쳐주세요~ (두번째 which 앞에 one까지두요!)