每年瓦兰提斯的元老们都会三次派遣载着给养的大船逆流向上，但是这怜悯之船总是迟到而且有时会带回比食物更多的人口。
Thrice each year the triarchs of Volantis send a galley upriver with provisions, but the mercy ships are oft late and sometimes bring more mouths than food.
当我船向上游行驶了七八百海里的时候，我已经在白天学习了如何当一个颇为大胆的逆流舵手。
By the time we had gone seven or eight hundred miles up the river, I had learned to be a tolerably plucky up-stream steersman, in daylight, and before we reached st.
淡水在上层向下流动，比重更大的盐水在下层逆流向上。
The salt water, being more dense, flows upstream under the fresh water which is flowing downstream.
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