効率

Which air conditioner do you think is the most efficient

This computer is powerful, efficient, and easy to use

I hear that studying in the morning is more effective. Studying one hour in the morning is as good as three hours at night

This behavior is energy-efficient in an environment where calories can be hard to come by

This inefficiency is a result of the animal's large body and massive legs and feet, which contribute a sideways motion to its walk

Your response is greatly appreciated and will enable us to prepare more efficiently

He put forward a plan for improving office efficiency

As yardsticks to measure the effectiveness of information retrieval there exist those called 'recall ratio' and 'precision ratio'