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网上有原句 In the 1820s substantial anthracite coal fields opened in eastern Pennsylvania, and as canals and eventually railroads reached into the region, substantial supplies became available to the nation’s burgeoning mills, forges, factories, and railways.
http://www.encyclopedia.com/doc/1G2-2536601339.html
不同意substantial supplies of(修饰语,用法就像thousands of)
用法不像thousands of, 更像the costs of industry 所以,substantial supplies of coal 核心词为supplies,主谓一致用were |
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