See How Steam Engines Work for more information.
更多信息见蒸汽发动机工作原理。
Steam engines had not yet been invented, nor would they for a long time.
蒸汽引擎还未被发明，并且在很长的一段时期内都不会。
The engines are driven by steam.
这些发动机是由蒸汽驱动的。
My son is crazy about steam-engines.
我儿子对蒸汽机车着了迷。
My son is crazy about steam-engines.
我儿子对蒸汽机车着了迷。
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