unearned increment

1. The rents she receives are a pure unearned increment, not the product of any efforts on her part.
   她收到的租金纯属自然增值，并非由她作出努力而挣得的。
2. The unearned increment of land should be made a reasonable distribution according to the contributions of essential elements.
   笔者认为，农地转非后的自然增值，应按要素贡献进行合理分配。
3. The progress state of study on the unearned increment to the stock of cuttlefish Sepiella maindroni de rochebrune in the coastal waters of North Zhejiang in 1983
   1983年浙北近海无针乌贼资源增殖研究进展

noun

1. an unearned rise in the market value of property resulting from general market factors