large air compressor
large AC three-phase synchronous motor 大型交流三相同步电动机 large air compressor 大型空气压缩机 large and medium DC motor 大中型直流电动机 ..
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施工工程师：摆弄那些大型玩具可能是很有趣的，比如推土机、前载车、反向铲、刮运机、平地机、铲车、起重机、大型水泵以及空气压缩机。
Operating engineers: Playing with giant toys like bulldozers, front-end loaders, backhoes, scrapers, motor graders, shovels, derricks, large pumps, and air compressors can be fun.
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