The chemical composition of said grinding ball comprises iron, carbon, silicon, manganese, chromium, sulfur and phosphorus.

该球的化学成分有铁、碳、硅、锰、铬、硫、磷。

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Preferably, said treatment or prevention comprises administering three oral doses of a safe and effective amount of the composition to an infant within 8-20 weeks of age at the time of dose 1.

对上述疾病的治疗或预防，8-20周的婴儿最好根据安全有效用药剂量，口服三次，按剂量1规定的时间服用。

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Preferably, said treatment or prevention comprises administering three oral doses of a safe and effective amount of the composition to an infant within 8-20 weeks of age at the time of dose 1.

对上述疾病的治疗或预防，8-20周的婴儿最好根据安全有效用药剂量，口服三次，按剂量1规定的时间服用。

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