qiǎng jī lín huī shí
hydroxyapatite (calcium phosphate mineral forming bone and tooth enamel)
羟
qiǎng
hydroxyl (radical)
基
jī
(bound form) base; foundation
磷
lín
variant of 磷[lin2]
灰
huī
ash
石
shí
abbr. for Shijiazhuang 石家莊|石家庄[Shi2 jia1 zhuang1], the capital of Hebei
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