Phosphate rock is one of the four most important basic chemical commodities.
磷酸盐类的岩石是四种最重要的基本化学商品之一。
The most important naturally occurring phosphate is phosphate of lime or tri-calcium phosphate found as the chief ingredient of phosphatic rock bones and phosphatic guanos.
自然产生的磷酸盐中以磷酸三钙最为重要，它是磷灰石，骨骼和磷质海鸟粪的主要成分。
Phosphatic fertilzers are all derived from calcium salts of phosphoric acid and these are found as raw bones apatite and phosphate rock.
无论什么磷肥，全都来自含钙的磷酸盐。生骨粉，磷灰粉，磷灰石含有大量的这种盐类。
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