Enhanced security measures since then, combined with a rise in airline travel due to the improving economy and low oil prices, have resulted in long waits at major airports such as Chicago’s O’Hare International. (Reading Comprehension Part A Text 1)
参考译文：自那以后，安全措施有所加强，加上选择航空旅行的人数也因经济好转和低油价而有所增加，导致旅客在芝加哥奥黑尔国际机场等主要机场等候时间过长。
必备词汇和短语：enhance 加强;combine with 与……相结合;due to 由于;result in 引起、导致
主干：enhanced security measures have resulted in long waits at major airports
重点分析：本句的难点在于同学们要理解 combined with a rise in airline travel… 这里一整个部分是做后置定语。其中还有due to the improving economy and low oil prices这个状语。最后要注意，整个句子内部的因果关系，理清之后我们就会发现，它其实讲的就是加强的安检措施和增多的旅客人数这些原因，导致了机场等候时间过长这个结果。这样一来，整个句子就一清二楚了。
