请求英语高手帮我分析分析下面几句的语法点!

题目

请求英语高手帮我分析分析下面几句的语法点!
1.High-technology marvels keep going awry lately—in cyberspace,where hackers have shown they can crash virtually any Web site any time,in real space,where the nation’s $60 billion missile defense system can’t hit a target,and down on plain old earth,where the most wondrous new bridge anywhere has been vibrating like a guitar string.
2.The bridge designer must build on centuries of accumulated experience about what can go wrong with such structures in a thousand big and little ways,and when he decides to innovate,he can only extrapolate from that experience and calculate and hope.
3.“We have searched and consulted worldwide on this,and apart from one possible case in Japan,of a bridge that joined a football stadium to a railway station,this appears to be completely new.”
4.Why don’t people know how to build a bridge by now,even if it is a novel “blade of light” design,with suspension cables strung unconventionally alongside the walkway instead of ov

答案