biogenic landforms
... biogenic motive 生物发生动机 biogenic landforms 生物成地形 biogenic pesticides 生物源农药 ; 寻求生物源农药 ...
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除此之外，被古生物学家委婉地形容成粪化石的粪便化石中也找到了古鹦鹉螺的壳。
On top of that, coprolites, as palaeontologists politely describe fossil faeces, have turned up with ammonite shells in them.
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