The Magnetic Field Projectual is a sturdy, transparent acrylic case that holds iron filings in a special viscous fluid.
磁场投射盒是一坚固、透明的压克力板,里面有铁粉在一种特别的维性液体里。
The Magnetic Field Projectual is a sturdy, transparent acrylic case that holds iron filings in a special viscous fluid.
磁场投射盒是一坚固、透明的压克力板,里面有铁粉在一种特别的维性液体里。
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