The industry was considered to be natural monopolies. 这个行业垄断经营过去被认为是理所当然的。
英语解释：the complete control of trade in particular goods or the supply of a particular service; a type of goods or a service that is controlled in this way 垄断；专营服务；被垄断的商品(或服务):
注：一词多义，单词一次只记一种意思即可。
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