难句解析：
①Since the dawn of human ingenuity, people have devised ever more cunning tools to cope with work that is dangerous, boring, burdensome, or just plain nasty.
▲该句是一个复杂单句，前面是since引导的一个时间状语，这个地方的dawn取其比喻的意思，表示早期。后面主句中有一个定语从句that is dangerous, boring, burdensome, or just plain nasty用来修饰work。
△本句结构比较简明，但是有一些词的意思比较难：ingenuity创造性，灵活性；nasty讨厌的。
②As a result, the modern world is increasingly populated by intelligent gizmos whose presence we barely notice but whose universal existence has removed much human labor.
▲本句的主句是the modern world is increasingly populated by intelligent gizmos，后面是两个定语从句，中间用but来引导。
△要看懂本句，重点在于看到gizmo一词后面的两个定语从句。在本句中，认不认识gizmo并不重要，因为从上下文中可以看出它和robot的意思应该大同小异。
③There are already robot systems that can perform some kinds of brain and bone surgery with submillimeter accuracy — far greater precision than highly skilled physicians can achieve with their hands alone.
▲该句是一个there be的结构，注意robot systems后面有一个修饰它的定语从句。而后面的破折号引出一个补充说明部分来修饰submillimeter accuracy。
△注意该句中的最核心的部分是robot systems，其它成分都是围绕着它来展开的。
④But if robots are to reach the next stage of laborsaving utility, they will have to operate with less human supervision and be able to make at least a few decisions for themselves — goals that pose a real challenge.
▲整句是一个条件句，注意后面的主句比较复杂，里面有两个并列的谓语，而后面破折号引导的是一个补充说明成分，修饰整个主句。
△要注意两个并列谓语之间的关系。
⑤But the human mind can glimpse a rapidly changing scene and immediately disregard the 98 percent that is irrelevant, instantaneously focusing on the monkey at the side of a winding forest road or the single suspicious face in a big crowd.
▲整句的主干部分是这样的，主语the human mind，并列谓语glimpse和disregard，逗号后面instantaneously focusing on the monkey at the side of a winding forest road or the single suspicious face in a big crowd这一部分做状语，修饰谓语。
△要注意两个并列谓语之间的关系并抓住句子的主干成分。
内容来自:可可英语 http://www.kekenet.com/kaoyan/201405/297978.shtml