1. A photomagnetic positronium annihilation model was proposed to explain the experimental facts.
   提出正电子素光磁湮没模型以解释实验事实。
2. An evident progress has been obtained recently in the study of photomagnetic effect (PME) since it was first studied in the late sixties.
   光磁效应研究始于六十年代末,它是磁光效应的一种逆效应。

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