New words：

efficiently [ɪ'fɪʃ(ə)ntli] adv.有效率地；有效地；效率高地井井有条地
inefficient [ˌɪnɪˈfɪʃ(ə)nt] adj.效率低的；能力差的；浪费的

必记高频搭配

work/study efficiently 高效地工作 / 学习
If you want to have more free time, you need to study efficiently.

use time/resource efficiently 高效利用时间 / 资源
We should use time efficiently in our daily life.

an inefficient method 低效的方法
This inefficient method wastes a lot of our time.

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