New words：
explicit [ɪkˈsplɪsɪt] adj.清楚明白的；易于理解的；明确的；直言的
必记高频搭配
be explicit about sth 对某事说得很清楚 / 很直白
He was explicit about his opinion.make sth explicit 把某事讲清楚、明确表达
She made it explicit that she would not give up.an explicit person 直言不讳的人
She is an explicit person who never hides her opinions.The map shows an explicit route to me.
You must give explicit answers to the questions.
route [rut] n.路线；路途；固定线路；途径
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.
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.
New words：
efficient /ɪˈfɪʃnt/ adj.效率高的；有功效的
必记高频搭配
1.修饰人 / 工作者：能胜任的、办事高效的
an efficient worker/employee 高效的员工
She is an efficient worker who always finishes tasks on time.be efficient in (doing) sth（在做某事方面高效 / 干练）
She is efficient in organizing class activities.be efficient at one’s work 工作效率高
He is very efficient at his work and rarely wastes time.2.修饰物 / 工具 / 方法：高效的、节省资源的
an efficient machine/tool 高效的机器 / 工具
This new efficient machine can double the production speed.an efficient method/way 高效的方法
We need to find an efficient method to solve this problem.efficient energy/resource use 能源 / 资源的高效利用
Efficient energy use is good for environmental protection.an efficient computer 运行流畅的电脑（口语高频，表 “高效运转的”）
3.修饰行为 / 过程：高效的、事半功倍的
efficient work/study 高效的工作 / 学习
Doing efficient study is more important than studying for a long time.an efficient operation 高效的操作 / 运营
The hospital’s efficient operation saved many patients’ lives.New words：
phenomenon [fəˈnɒmɪnən] n.现象phenomena [fəˈnɒmɪnə] phenomenon的复数形式
必记高频搭配
a physical/chemical phenomenon 物理 / 化学现象
Boiling is a common physical phenomenon in daily life.a natural phenomenon 自然现象
Scientists are studying many natural phenomena like lightning and thunder.a social phenomenon 社会现象
Online shopping has become a popular social phenomenon in recent years.a common/unusual phenomenon 常见的 / 罕见的现象
It’s a common phenomenon that students feel nervous before exams.social and cultural phenomena 社会文化现象