在19世纪,许多机器由蒸汽操作。

In the 19th century, many machines were operated by steam.

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In the 19th century, many machines were operated by steam.

steam 是名词,指"蒸汽",即水加热后变成的气态形式。蒸汽在工业革命时期被广泛用作动力来源,驱动各种机械设备运转。

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