Chinese languages

请问诸位财经专家！ "未收回资金" 英文是什么？？

Unrecovered capital（未收回资金）

extra gifts:
Internal rate of return (IRR,IROR) (内部收益率)
Simple (or conventional) investment（常规投资）
Non-simple (or non-conventional ) investment（非常规投资） trial-and error method（内插－试算法）
Benefit-cost analysis (收益差别分析法)
Benefit/cost ratio(收益成本率)
Benefits, costs and disbenefits (收益，成本，负收益）
Social discount ratio（社会折现率）
Secondary effect（间接效果）
Primary benefit（直接收益）
Secondary benefit（间接收益）

Thanks so much for the valuable input.