unofficial

adj.

非官方的，非正式的；不作为官方活动的；

1. This statement is unofficial and not binding on us.
   这项声明是非官方的，对我们没有约束力。
2. He's a kind of unofficial adviser, but I'm not sure exactly what he does.
   他像个非官方的顾问，但说不好他究竟是干什麽的。
3. I received an unofficial appointment.
   收到非正式的录取通知。

The Unofficial Economy in Transition
The Unofficial Economy in Transition
The Unofficial Economy and Economic Development
Unofficial Fees in Bangladesh: Price, Equity and Institutional Issues
Corpus-based schema matching (unofficial)
The Unofficial Economy and Economic Development. Comments and Discussion
Regulatory Discretion and the Unofficial Economy
Contributions of an Unofficial Conflict Resolution Effort to the Israeli-Palestinian Breakthrough
Integrating the Unofficial Economy into the Dynamics of Post-Socialist Economies: A Framework of Analysis and Evidence
Health economics in low income countries: adapting to the reality of the unofficial economy.