efficiency可数吗

　　It was achieved with minimum fuss and maximum efficiency.

　　它以最少的慌乱和最高的效率被做到了。

　　Defrost the fridge regularly so that it works at maximum efficiency.

　　定期给冰箱除霜能取得最大效率。

　　Our administrator is a paragon of neatness, efficiency, and reliability.

　　我们的.管理者是整洁、高效、真实可信的杰出典范。