... perfecting engine 精磨机 perfecting machine 双面印刷机 perfectings 每令纸中多加的纸张 ...
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perfecting machine
完善机
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Enlisting the help of an engineer, Whelan has spent the past 18 months perfecting the machine and has created a highly adaptable device which snaps on around the wheel of the bicycle.
CNN: Virtuous cycles
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