Magnetic field viewing film
- 磁场观察膜（磁场观察膜是一种薄膜，用于观察静止或缓慢变化的磁场，能显示位置和方向。易变形的半透明薄片，磁力线平行于表面呈白色，垂直呈黑色。置于磁极上时，大部分区域呈现黑色）
Magnetic field viewing film
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abstract:
Magnetic field viewing film is used to show stationary or (less often) slowly changing magnetic fields; it shows their location and direction. It is a translucent thin flexible sheet, coated with micro-capsules containing nickel flakes suspended in oil.
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WordNet