大多数来自天然水源的普通水约含有0.015%的氧化氘，可透过蒸馏、电解或化学过程来提高或去除其含量。
Water from most natural sources contains about 0.015% deuterium oxide; this can be enriched or purified by distillation, electrolysis, or chemical processing.
这些动物的消化道是沙门氏菌的天然家园，因此它们的粪便就为细菌侵入食物或水源提供了载体。
Because the natural home for Salmonella bacteria is in the gut of these animals, their poop becomes a carrier of the germ if it gets into food or water.
自从2006年大坝竣工以来，天然泉水曾经滋养费坡拉村的水源干涸了。
Since the dam was completed in 2006, the natural spring that once fed Pipola has dried up.
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