Steel mills are expensive to construct. But once built, the investment costs are "sunk".
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But to be honest, I had no idea how they would respond once it was built.
但老实说，我还真不知道一旦树屋建造好楼之后他们还会做出何种反映。
Ice palaces were popular in the Soviet Union, to which Turkmenistan once belonged, but they were built in the freezing cities of the north, far away.
冰雪宫殿在前苏联非常流行(土库曼斯坦曾属于前苏联)，可它们大都建在地冻天寒的遥远的北方城市。
The area around Los Angeles was once too dry to sustain the population of a huge city. But infrastructure was built that allowed water to be pumped in from east of the region.
其中一些已很明显，洛杉矶曾因太干旱而不能满足一个大城市人口所需的用水量，但美国人修建了东水西调的基础设施。
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