I want to know what the constraints are on using the phrase one of the. He is one of the soldiers who fight for their country. 「one · 一个」隶属于上海有树文化传播有限公司，是由韩寒主编和监制，原《独唱团》主创成员共同制作的文艺应用软件。发布不到 24 个小时就登上 app store 免费排行总榜第一名。 不追热点，不关时.
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Is it used correctly in this example?
