Constructivism holds that knowledge is not passively received but activeconstruction by the cognitive subject based on the prior knowledge.
建构主义认为:知识并非被动地接受,而是由认知主体在原有知识基础上主动建构的。
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This is early work for sure, and following convention, IE USES a vendor prefix (-ms) on the namespace because the spec is genuinely under activeconstruction.