英语词汇“元生代”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	元生代
释义	元生代 yuán shēng dài地质年代之一。介于始生代与古生代之间。此一时期海洋中已有无脊椎动物、藻类、菌类等生物。距今约二十亿年。
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