When Thomas Edison saw his first demonstration of the electricity are light, he knew then that he had found the ultimate challenge and the perfect goal toward which to ________ his creative energies.
句意： 在爱迪生看到他是用光第一次证明了电存在时， 他便知道了自己已经发现了最大的挑战和最完美的目标， 爱迪生要朝着那个方向去转化他的创造力。 convert 转变， 转换。 perfect 使完美， 使熟练。 accomplish完成， 实现。 direct 管理， 指挥。