There are 94 production lines at the Zhengzhou manufacturing site, and it takes about 400 steps to assemble the iPhone, including polishing, soldering, drilling and fitting screws.
郑州这处生产基地有94条生产线。组装一部iPhone需要大约400个工序，包括抛光、焊接、钻孔和上螺丝。
There are 94 production lines at the Zhengzhou manufacturing site, and it takes about 400 steps to assemble the iPhone, including polishing, soldering, drilling and fitting screws.
郑州这处生产基地有94条生产线。组装一部iPhone需要大约400个工序，包括抛光、焊接、钻孔和上螺丝。
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