Translation of "estimated" into Chinese

The value of the painting was estimated at several million dollars.

这幅画被估价数百万元。

Last time I counted, I estimated that I know around 2500 Chinese characters.

我上次计算,估计我已经学会了两千五百个汉字左右。

Still, there is at present no effective coordinating mechanism that focuses on the issuance of questionnaires or on estimation and aggregation methods.

但目前并无任何有效的协调机制,来集中处理问题单的印发或评估和汇总的方法。