of是介词一般后接名词,代词或动名词；
about是介词,后面一般加名词,或动名词。
例句
Most of the houses are built of stone.
这些房子多数是用石头建造的。
We talk glibly of equality of opportunity.
我们大谈特谈机会的'均等。
Wine contains about 10% alcohol.
葡萄酒含有约10%的酒精。
He's very intense about everything.
他对一切都很热心。
It's about 2 metres wide.
它大约2米宽。
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