1、In practice use W-4 power shovel often appears troubles, because walking system is frequently used.
在實際使用過程中，w—4電鏟的行走機構(gòu)由于使用頻率高，經(jīng)常出現(xiàn)故障。

2、a power shovel that is driven by steam
用蒸汽驅(qū)動的動力鏟。

3、A power shovel that is driven by steam.
用蒸汽驅(qū)動的動力鏟。