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1·Watt's engines were clearly much more economical than those of Savery and Newcomen but were relatively inefficient by modem standards.

瓦特的发动机很显然要比萨尔韦和纽科门的经济，但用现代的标准来看， 效率相对较低。

2·One way to overcome this limitation was to use pressures greater than one atmosphere, and this was done by Thomas Savery in 1698 in a steam engine designed to pump water from mines.

克服这一局限的一个途径是采用大于一个气压的压力，1698年托马斯-萨韦里曾经将这个办法用在一台从矿井中抽水上来的蒸汽发动机之中。