The giant magnetoresistance (GMR) effect allows drives like this one, less than an inch in diameter, to detect the tiny magnetic fields that store data in portable electronic devices.
巨磁电阻(GMR)效应使这样一个驱动器的直径不到一英寸，检测在便携式电子设备中存储数据的微小的磁场。
This is a cylinder composed solely of carbon atoms, and one of its properties is good electrical conductivity. In effect, nanotubes act as wires a few billionths of a metre in diameter.
这是一种仅由碳原子组成的圆柱体，其中一个特性就是具有很好的导电性。
Use diameter 500 super big mirror roller, iron effect much better.
采用直径500的超大镜面滚，熨光效果更为明显。
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