Charity Navigator says the most efficient charities spend at least seventy-five percent of their budget on their programs and services.

VOA: special.2009.11.02

There are other vectors that are very efficient at getting DNA into cells.

但是存在某些其它载体,能易如反掌地将DNA导入细胞

耶鲁公开课 - 生物医学工程探索课程节选

And things are not as efficient as they were at the beginning of the day

而工作的进展也没有之前那么有效了。

Let's 课堂 - SpeakingMax英语口语达人

U. will be more efficient at doing good and refrain from making inane decisions.

FORBES: Ireland's 'No' Gives Europe Breathing Room

Indeed, many people assume that biotechs are more efficient at inventing drugs than drug companies are.

FORBES: Biotech Blues

The US-based scientists discovered that older ants were significantly less efficient at cutting leaves.

BBC: Earth News - Leaf-cutter ants retire when their teeth wear out