The reason: it once had water.
原因就是：她曾经有水。
Wuxi is famous for its water but it once had trouble because of water.
无锡因水著名，也曾因水而困。
The planet is probably rocky, Fabrycky said, but any water or atmosphere it may once have had would have evaporated early in its lifetime.
法布瑞基说，行星很可能是由岩石组成的，如果它曾有过水或空气的话，也在早年就蒸发掉了。
Even so, water levels have fallen steeply: the Ganges once had an average depth of about 197 ft. (60 m) around Varanasi, but in some places it is now only 33 ft. (10 m).
即使这样，水位还是下降了很多：在瓦拉纳西，恒河曾经平均水深197英尺(60米)，但是有些河段现在只有33英寸(10米)。
Once the cylinder had been filled with steam it was cooled directly by the application of cold water.
蒸汽充溢汽缸后，它会因为冷水的温度而直接冷却。
Of course we do not go to restaurants or if we do go to return friends'hospitality once or twice it is always just at the time when water shield is not available so we have not had it once this year.
我们当然不上馆子，偶然有一两回去扰朋友的酒席，恰又不是莼菜上市的时候，所以今年竟不曾吃过。
It was assumed that liquid water had once flowed on Mars and an ancient atmosphere might have supported living organisms.
据设想，火星上曾有液态水流淌，古代的大气可能维持过生物的生存。
Once a great river had flowed through the city, but the water had long since vanished, and it was now only a wide ditch of grey dust.
城里曾经有一条河，但河床早已干涸，只剩下一条宽宽的灰色土沟。
Once a great river had flowed through the city, but the water had long since vanished, and it was now only a wide ditch of grey dust.
城里曾经有一条河，但河床早已干涸，只剩下一条宽宽的灰色土沟。
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