Translation of "usefulness" into Chinese

Recognizing their utility and effectiveness, the Guatemalan Government uses control lists concerning energy, chemicals and precursors.

危地马拉政府认识到能源、化学品和前体管制清单具有效用和效益,因此使用此种清单。

Appreciation was expressed for the useful and informative nature of the two reports.

这两份报告资料丰富,很有用处,因此受到赞赏。

This book will be of great use to us.

这本书会对我们有很大用处。