two-stage double acting air compressor
... two-strand double exchange 双线双交换 two-stage double acting air compressor 两级双作用空气压缩机 two-strand double crossing over 两线双交换 ...
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two-stage double acting air compressor
两级双作用空气压缩机
以上为机器翻译结果，长、整句建议使用 人工翻译 。