成鐵紀 的释义 | Babel Free
ʈ͡ʂʰɤŋ³⁵ tʰi̯ɛ²¹⁴⁻²¹ t͡ɕi⁵¹释义
the Siderian period (part of the Paleoproterozoic era, spanning from 2.5 to 2.3 billion years ago)
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