排比列舉兩例：

1. What is happiness?

The most immediate reason for it being difficulkt for us to define the concept of happiness is the multitude of attitudes among average people. For example, a sick person is likely to deem health the thing that will most likely bring him or her happiness; a lonely heart tends to regard genuine love from other human beings as the greatest happiness; and a man confined to a wheelchair will have no other wish than to walk like a normal person.

2.What changes computers bring to the world?

Computers and modems have transformed the world into a global village. Messages are sent instantly around the world via the Internet; a bargain is made between a gentleman in Russia and a lady in Argentina; and students studying abroad send voice mails (and video information by using Net meeting system) to their loved ones at home, again by using the computer

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