求翻译：债券投资组合中应以收益性最高的公司债券为主。如：沪市债券中的青啤债等。合适的投资策略有：利率预期策略；债券互换策略；回购放大策略；替代互换选择策略；铃型投资策略。是什么意思？

The bond portfolio should be the main income of the highest corporate bonds. Such as: the Shanghai stock market bond the Tsingtao debt in Appropriate investment strategy: the interest rate expectations, strategies; bond swap strategy; repurchase amplification strategy; alternative interchange option

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In the bond investment profolio should by the rentability highest debenture bond primarily.For example: In Shanghai bond blue beer debt and so on.The appropriate investment strategy includes: Interest rate anticipated strategy; Bond exchange strategy; Returns buys the enlargement strategy; Substitut

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