Producing millions of gallons of oil each year , the industry was widely seen as unassailable , with advocates scoffing at would-be illumination substitutes like lard oil and camphene .

每年生产数百万加仑的油，捕鲸业被广泛认为是无懈可击的，支持者甚至嘲笑那些可能的照明替代品，如猪油和莰烯。