We said something must be done and we got out the first sketch of the plan. Then, after I first went to China, I met Wang Ling, Wang Ling worked on the gunpowder story, and he worked very well. Then he came and joined me in Cambridge.
後來我去中國，遇見了我的第一個合作者王鈴，他那時候正在研究火藥，做得相當好，後來也來到劍橋加入我們。