Why is it that Nelson has access to a cutting-edge technology, like the cellphone, but doesn't have access to a 100-year-old technology for generating electric light in the home?
为什么Nelson有机会享用 像手机这样的前沿科技成果 但却不能在家用上电力？ 人们早在100年前就已经发明了这一科技啊？