To blow up something is to make it explode. The woman asks the scientist why he blew up the bell tower. With the bell tower destroyed there is no bell. The scientist says he wanted to win the Nobel （No-bell） prize, which is a famous science award.
科學家為了得到著名的諾貝爾（讀成No-bell，無bell）獎，不惜把bell tower（鐘樓）引爆，令其變成no bell。
www.britishcouncil.hk/english
■漫畫&說明︰英國文化協會
逢星期五見報