... perfect stuff 符合规定配比的混合浆 perfecting engine 精磨机 perfectings 每令纸中多加的纸张 ...
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perfecting engine
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以上为机器翻译结果，长、整句建议使用 人工翻译 。
When aeronautical engineers started perfecting the jet engine (a process that took a few decades), they dreamed of airplanes that would move much faster and carry much heavier payloads.
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