Walk me through how you would construct a comprehensive convertible bond pricing model. Explain how this model would be used to derive its key Greeks, specifically Delta, Gamma, and Vega. In your discussion, please highlight the impact of equity volatility, the interest rate structure, and credit risk on both the convertible's valuation and its Greeks.

可转债作为一种混合型证券，其定价和风险管理远比普通债券和股票复杂。请你详细阐述在当前市场环境下，如何构建一个综合的可转债定价模型，并解释此模型如何用于计算其关键的希腊字母（Greeks），特别是 Delta, Gamma 和 Vega。在讨论过程中，请着重强调股票波动率、利率结构以及信用风险对定价和希腊字母的影响。