Walk me through the purpose and key components of both LCR and NSFR, and explain how they are calculated. Furthermore, from a practical perspective, what are the challenges and potential trade-offs a bank might encounter when striving to meet both of these regulatory liquidity ratios concurrently?

在当前复杂多变的金融环境下，一家大型商业银行在进行流动性风险管理时，LCR（流动性覆盖率）和NSFR（净稳定融资比例）是两个核心的监管指标。请你详细阐述LCR和NSFR在流动性风险管理中的作用、它们的主要构成要素及计算原理。并结合实际操作，分析银行在同时满足这两个指标时可能面临的挑战和潜在的权衡取舍。