实际上，企业发行各种类型的债务时，不仅要决定其数量，还要决定其期限、优先级、限制性条款、有无担保、是否可转换以及是否可赎回等许多方面。
In fact, when a company wants to issue debt, it should determine not only the magnitude but also the maturity, seniority, mortgage, convertibility and callability, etc.
高收益债券通常在期限过半时不可赎回；
High Yield bonds are usually non-callable for about half of life of the bond;
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