1. | 效率高的;有功效的doing sth well and thoroughly with no waste of time, money, or energy |
an efficient secretary 效率高的秘书 | |
efficient heating equipment 效能好的供暖设备 | |
the efficient use of energy 能源的有效利用 | |
As we get older, our bodies become less efficient at burning up calories. 随着一天天衰老,我们的身体消耗热量的功能逐渐减弱。 | |
fuel-efficient cars(= that do not use much fuel) 节能汽车 |