<美>蒸汽铲,蒸汽挖土机;
The big steam shovel lowered its scoop into the ship and pulled it up with a load of gravel.
那个大汽铲把铲斗放低,伸到船上,铲上一堆小石子。
The steam-shovel burrowed into the soft ground.
蒸汽铲掘进软土里.
1839-William Otis receives a patent for the steam shovel.
1839年的今天,威廉·奥蒂斯收到了蒸汽铲的专利权。
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