Thus our bodies continuously exchange old substance for new, just like a spring which more or less maintains its form and movement, but in which the water molecules are always different.

因此，我们的身体不断地把旧物质替换成新的，就像一个喷泉，或多或少地保持着它的形式和运动，但其中的水分子总是不同的。

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The walls are made of salt blocks stuck together with a cement-like substance made of salt and water.

墙壁是由盐块和一种由盐和水制成的粘合剂砌成。

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She said: "This technology is based on the chemistry of oil and water and has the special property of transforming carbon dioxide into a limestone-like substance."

她说道：“这想技术基于水和油的化学性质，它们的特殊性质能将二氧化碳转化成石灰石类物质。”

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