permanent magnet bar code 永磁条形码 ; 永久磁铁条形码 ; 永久磁铁条码
magnet bar code 磁条码 ; 磁棒形码
Square magnet bar 方型磁棒
canvas magnet bar 帆布磁铁酒吧 ; 画布磁铁栏 ; 帆布磁棒
bar magnet 磁棒 ; 磁条 ; 棒磁铁
bar-magnet velocity meter 磁棒测速计
code bar drive magnet 编码条驱动磁铁
My 12 year old had a lesson in his science course later that day that mapped magnetic fields of a little bar magnet. He showed me the results.
当天的晚些时候，我12岁的大儿子在他的自然科学课上绘制了一幅磁铁的磁场分布图。他向我展示他的成果。
My 12 year old had a lesson in his science course later that day that mapped magnetic fields of a little bar magnet.
当天的晚些时候，我12岁的大儿子在他的自然科学课上绘制了一幅磁铁的磁场分布图。
The Earth's magnetic field is roughly like that of a bar magnet, with two opposite poles.
地球的磁场大致就像是一块拥有两个磁极的磁铁。
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