efficient

効率的な、能率の良い

時間やお金、エネルギーを無駄にせず、うまく働く。

やさしい英語で： Working well without wasting time, money, or energy.

• The new system is very efficient.
• Our efficient staff finished the work early.
• This heater is more efficient than the old one.

使い方： efficient at doing something (She is efficient at organizing large events.)

類義語： well-organized, economical

反対語： inefficient, wasteful

よく使う表現： efficient system, efficient service, energy efficient, highly efficient

効率の良い

供給されたエネルギーの一定の割合を、役立つ仕事に変える。

やさしい英語で： Turning a stated share of the energy supplied into useful work.

• The engine is thirty percent efficient.
• This motor is more efficient at lower temperatures.
• A perfectly efficient machine would waste no energy.

使い方： a number + percent efficient (The motor is eighty percent efficient.)

反対語： inefficient

よく使う表現： thermally efficient, mechanically efficient, ninety percent efficient

作用する、結果を生む

直接ある結果を生んだり、何かを存在させたりする。

やさしい英語で： Directly producing an effect or bringing something into existence.

• The builder is the efficient cause of the house.
• The court considered the efficient cause of the injury.
• In this theory, an efficient cause brings about a change.

類義語： causative

よく使う表現： efficient cause, direct efficient cause