すうおくねん
Noun
1.
several hundred million years
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数億年の間に、多くの生物種が誕生し、絶滅しました。
Over several hundred million years, many species were born and became extinct.
宇宙の歴史から見れば、人類の歴史は数億年どころか瞬きする間もないほど短い。
From the perspective of cosmic history, human history is not even several hundred million years, but as short as the blink of an eye.
この化石は数億年前の生物のものです。
This fossil belongs to a creature from several hundred million years ago.
数億年という途方もない時間をかけて、現在の地形が形成されました。
The current topography was formed over an unimaginable period of several hundred million years.
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