There was no significant age-related change in either the bone breaking strength, ash weight, bone phosphorus content, or the ratio of phosphorus and calcium content.
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bone phosphorus content
骨磷含量
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The number of bone dust in animal feed is main reasons for high content of phosphorus in its waste water.
动物饲料中加入大量骨粉是其污水中含磷过高的主要原因，而常规活性污泥法对磷的去除率却很低。
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