usefulness

The advisory group has outlived its usefulness.

顾问组已失去它的作用。

Badly written questions limit the usefulness of questionnaires.

问题设计得不好，调查问卷的用就会打折扣。

He has outlived his usefulness.

他已老而无用。

The report is of potential usefulness to the government.

这个报告可能对政府有用。

The index adds appreciably to the usefulness of the book.

索引明显地这本书的实用价值。

I was persuaded of the usefulness of his new device.

我相信他的新装置的实用性。

The theory is of limited usefulness.

这个理论用有限。

Not only it can decide solely the lamp usefulness, but also available in mends light, sidelight, top light and the use of foot light.

它既可作主光灯用，也可作为补光、侧光、顶光、和脚光的使用。

The present study is the first to report on the usefulness of puromycin for production of enhanced green fluorescent protein (EGFP) transgenic piglets after somatic cell cloning and embryo transfer.

本研究是第一次报道在体细胞克隆和胚胎移植后成功应用嘌呤霉素标记获得转强化型绿色荧光蛋白（EGFP）基因的小猪。