It''s easy to blame the decline of conversation on the pace of modern life and on the vague changes taking place in our ever-increasing world.（相当于the changes which take place……）
There was a very interesting remark in a book by an Englishman that I read recently giving what he thought was a reason for this American characteristic.（相当于which gave……）
How many of us attending， say， a meeting that is irrelevant to us would be interested in the discussion？（相当于How many of us who will attend……）
（2）过去分词与被修饰词之间具有被动意义。如：
Good news was sometimes released prematurely， with the British recapture of the port announced half a day before the defenders actually surrendered.
（相当于…recapture of the port which had been announced…）
Just as the value of a telephone network increases with each new phone added to the system， so does the value of a computer system increase with each program that turns out.
（相当于…each new phone which is added to…）
The author gave a detailed description based on his personal observation of nature.
