 … a DN explanation answers the question “Why did the explanandum-phenomenon occur?” by showing that the phenomenon resulted from certain particular circumstances, specified in \(C_1,C_2,\ldots,C_k\), in accordance with the laws \(L_1,L_2,\ldots,L_{\gamma}\). By pointing this out, the argument shows that, given the particular circumstances and the laws in question, the occurrence of the phenomenon was to be expected; and it is in this sense that the explanation enables us to understand why the phenomenon occurred. (1965b: 337, italics in original)