这个句子后半句啥意思？

来源：百度知道 编辑：UC知道 时间：2024/06/07 10:09:33
In recent years, research has suggested more health value from vitamin D than had once been thought.

than had once been thought 这里怎么翻译？？希望哪位老师除了帮我翻译下，还能给我讲解一下好吗? 由衷的感谢

近几年，研究表明维他命D对人体健康比人们原来所认为的有更大的价值。

than had once been thought 就是比人们曾经所想的内容

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近几年，研究表明维他命D对人体健康比人们原来所认为的有更大的价值。

than had once been thought 是than the health value from vitamin D had once been thought by people的省略

就是 比人们曾经认为维他命D所具有的健康价值更…