Objective To know and master the charater of the genesis and development and epidemic of flourine poisoning.
目的了握黔南地区地性氟中毒的、及流行特征。
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They were poisoned because they ate vegetation that had been contaminated with fluorine as a result of the volcanic fallout.
它们中毒了,因它们吃了因火山沉降物污染的植物。
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