请问这一句中,of 用法是什么?Of all the fish we catch in the world,we eat only three quarters of it.这一句中of all the fish we catch in the world在句子中充当什么成分?这种是什么用法啊?

问题描述:

请问这一句中,of 用法是什么?
Of all the fish we catch in the world,we eat only three quarters of it.
这一句中of all the fish we catch in the world在句子中充当什么成分?这种是什么用法啊?