A power shovel that is driven by steam.
用蒸汽驱动的动力铲。
They use a mechanical antigravity device driven by engines developing approximately 80,000 horse power.
他们使用一种机械式的无重力装置，用大约80,000马力的引擎来驱动。
They are driven by hydraulic power and equipped with a safety device against overload.
本系列机床采用液压传动，工作平稳，能无级调速，并有超负荷保险装置。
They are driven by hydraulic power and equipped with a safety device against overload.
本系列机床采用液压传动，工作平稳，能无级调速，并有超负荷保险装置。
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