求翻译：　　雷曼破产后国际金融市场动荡不安，由于股价下跌和国内经济景气恶化，金融机构经营环境日益严峻。为维持金融机构信用中介功能，确保金融系统稳定，日本银行决定购买金融机构持有的股票，同时向金融机构提供次级贷款，帮助其改善资本充足率。　　一是购买金融机构持有的股票。　二是向金融机构提供次级贷款。是什么意思？

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