He was using several magnets together which compounded the effect. He said that he knew it was a demonstration of the magnetic field of the magnets.
他把几块磁铁合并起来加强了磁力，儿子说他知道这正显示了磁铁的磁场。
He was using several magnets together which compounded the effect. He said that he knew it was a demonstration of the magnetic field of the magnets.
他把几块磁铁合并起来加强了磁力，儿子说他知道这正显示了磁铁的磁场。
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