蛋壳的矿物质几乎为纯碳酸钙，还有一些镁，形成放射状结晶。

The mineral of the shell is almost pure calcium carbonate, with some magnesium, formed of radiating crystals.

youdao

蛋壳的矿物质几乎为纯碳酸钙，还有一些镁，形成放射状结晶。

The mineral of the shell is almost pure calcium carbonate, with some magnesium, formed of radiating crystals.

youdao