1800年为止,1000多台蒸汽发动机在英国投入使用,实际上,直到1830年之前,英国在蒸汽发动机生产上保持着垄断
steam engine 蒸汽机
retain a monopoly production on保持对...产品的垄断
were in use 被投入使用
more than 超过
By 1800 截止到1800年
virtual实际上的,只有和计算机方面扯上关系才是"虚拟的"意思.
virtual这个词什么意思?By 1800 more than a thousand steam engines we
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翻译：Their engines are nine times more powerful than a normal