那艘摆渡用的小蒸汽船在镇子下游大约一英里的地方，顺流而下。
The little steam ferry-boat was about a mile below the village, drifting with the current.
盐水的蒸汽压，比纯水的蒸汽压小。
A salt in water solution will have a lower vapor pressure than a solution of pure water.
因此，当这些水蒸汽或其他高水分小流碰上地面时，洪水就形成了。
Floods can result where these, and other high-moisture streams, hit land.
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