An evident progress has been obtained recently in the study of photomagnetic effect (PME) since it was first studied in the late sixties.
磁
研究始于六十年代末,它是磁

的一种逆
。
电磁

An evident progress has been obtained recently in the study of photomagnetic effect (PME) since it was first studied in the late sixties.
磁
研究始于六十年代末,它是磁

的一种逆
。
声
:以上例句、词性分

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