食土的习俗，食土的行为很常见，或许是因为“干净的”泥土似乎能给予人体一些保护，免受寄生物、病原体的侵扰。
The practice of dirt-eating, or geophagy, is common, perhaps because "clean" dirt appears to impart some protection against parasites and pathogens.Cynthia Graber reports.
食土的习俗，食土的行为很常见，或许是因为“干净的”泥土似乎能给予人体一些保护，免受寄生物、病原体的侵扰。
The practice of dirt-eating, or geophagy, is common, perhaps because "clean" dirt appears to impart some protection against parasites and pathogens. Cynthia Graber reports.
全世界咀嚼泥土的人，不只是在饿到不行什么都吃的时候才食土。
People around the world munch on dirt, and not just when they're hungry enough to eat anything.
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