New words：

efficiency [ɪˈfɪʃnsi] n.效率；效能；功效
inefficiency [ˌɪnɪˈfɪʃnsi] n. 低效；无能

必记高频搭配

improve efficiency 提高效率
Making a study plan is a good way to improve efficiency.

increase efficiency 提升效率
New machines can greatly increase efficiency in the factory.（

avoid inefficiency 避免低效
Making a plan before working can avoid inefficiency.

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