问题描述：
帮忙翻译一下英文,经济方面的
Sinking fund – nbuilding a sum for retirement nthe periodic retirement of a number of bondsselected randomly.
Call provision - borrower right to retire bond beforematurity.
Sinking fund – nbuilding a sum for retirement nthe periodic retirement of a number of bondsselected randomly.
Call provision - borrower right to retire bond beforematurity.
问题解答：
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