并认为，这些债务根据研究侧重点的不同，可以有显性债务和隐性债务、直接债务和或有债务、赤字性债务、生产性债务和建设性债务等多种分类。
Those debts, with difference of special emphasis, can be divided into explicit and implicit debts, direct and contingent debts, deficit debts, productive debts and constructive debts.
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