This was also a time of declining demand in the United States.
在这段时间中,美国的需求量持续下滑。
This was also the time of the industrial revolution, which brought a tremendous increase in the use of fossil fuels such as coal.
它也是在工业革命时期的,带来了煤等化石燃料使用量的巨大增长。
There was also a complex system of manners by this time.
那时还有一套复杂的礼仪体系。
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