问题描述：
看一个句型结构
But we are much less conscious of the extent to which work provides psychological well-being
which是指 extent?provides sth.to a certain extent 有着用法么 请列举
But we are much less conscious of the extent to which work provides psychological well-being
which是指 extent?provides sth.to a certain extent 有着用法么 请列举
问题解答：
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