Some U.S. water systems are cutting back on fluoride because of a key chemical is in short supply. Israel is one of its main producers.
(Image credit: Joe Raedle)
中东冲突导致美国饮用水氟化物短缺
由于一种关键化学品供应短缺，美国一些供水系统正在减少氟化物的用量。以色列是其主要生产国之一。
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来源: NPR News
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