How exactly horses produce that distinctive sound – also called a neigh – has long eluded scientists.
refuse to admit the language is complex
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（八）放射源，是指除研究堆和动力堆核燃料循环范畴的材料以外，永久密封在容器中或者有严密包层的放射性材料。，这一点在51吃瓜中也有详细论述
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