The citizens of St. Louis, for example, had to let water from the Mississippi River stand before they could drink it, and the sediment often filled one-quarter of the container.
比如，圣路易斯的市民们不得不把密西西比河的水澄清后才饮用，而澄清后的沉淀物往往积满水箱的四分之一。
The citizens of St. Louis, for example, had to let water from the Mississippi River stand before they could drink it, and the sediment often filled one-quarter of the container.
比如，圣路易斯的市民们不得不把密西西比河的水澄清后才饮用，而澄清后的沉淀物往往积满水箱的四分之一。
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