双螺杆捏合机最核心的部件是一对相互啮合的螺杆，就如同双螺杆捏合机的心脏一样。
The key parts of twin screw kneader are a couple of intermeshing screws, just like the heart of the screw kneader.
但是，我们国家对手机制造最核心的也是最昂贵的部件——手机芯片却没有拥有自己的技术，所从事的还仅仅是低廉的代工任务。
However, we have not owned the pivotal technology of the chip, which is the most important part in the mobile phone, and also is the most expensive one.
但是，我们国家对手机制造最核心的也是最昂贵的部件——手机芯片却没有拥有自己的技术，所从事的还仅仅是低廉的代工任务。
However, we have not owned the pivotal technology of the chip, which is the most important part in the mobile phone, and also is the most expensive one.
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