Aureliano, who could not have been more than five at the time, would remember him for the rest of his life as he saw him that afternoon, sitting against the metallic and quivering light from the window, lighting up with his deep organ voice the darkest reaches of the imagination, while down over his temples there flowed the grease that was being melted by the heat.
那个，siting…的从句是修饰什么的？为什么突然用doing形式？
还有那个organ voice后面怎么直接加名词darkest reaches？
while down over 是什么用法？
感谢感谢感谢！