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1. The company's classification of securities is based on their risk levels.
该公司将证券分为高风险、中风险和低风险。
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2. The government classified the securities into different categories for tax purposes.
政府将证券分为不同的类别以便于税务目的。
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3. The financial market is a complex system that requires careful classification of securities.
金融市场是一个复杂的系统，需要仔细地对证券进行分类。