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be ignorant of/about sth这个句型中,about/of表示什么意思或关系?

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be ignorant of/about sth这个句型中,about/of表示什么意思或关系?
1. 在这个句型中,介词 of 表示“关于、涉及”,用 about 也可以,但是用 of 更正式.
2. of 的这种用法出现在很多形容词短语中,例如:
We are appreciative of your help.
The burning of coal is very wasteful of energy.
We are proud of China.
Why are we tolerant of this crime?
3. 有一些动词后带的 of,也有“关于、涉及”的含义,例如:
I often dream of visiting Beijing.
The story tells of a lonely old man.
Experts often warn of the health risks caused by air pollution.
The photo reminded me of my childhood.
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