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

New words：

conduction [kən'dʌkʃn] n.（热或电等能量的）传导
conductor [kənˈdʌktər] n.指挥家；导体；售票员；列车长

必记高频搭配

heat/electric conduction 热传导 / 电传导

Heat conduction is a common physical phenomenon.

the conduction of sound 声音的传播 / 传导

Water is good for the conduction of sound.

a music conductor 音乐指挥家

Her dream is to become a famous music conductor in the future.

a good/bad conductor 良导体 / 不良导体

Plastic is a bad conductor of electricity.

a bus/train conductor 公交 / 火车售票员

The bus conductor asked me to buy a ticket when I got on the bus.

phenomenon [fəˈnɒmɪnən] n.现象

New words：

conduct[ˈkɑnˌdʌkt] v.实施；执行；表现；引导

必记高频搭配

核心义 1 ：做；实施；进行

conduct an experiment 做实验

We need to conduct an experiment to test the new theory.

conduct a survey/research 做调查 / 开展研究

The students conducted a survey about students’ reading habits.

conduct a study 开展研究

Scientists conducted a study on air pollution in big cities.

conduct an activity 组织活动

Our class will conduct a volunteer activity this weekend.

核心义 2 ：引导；带领；指挥

conduct sb around sp 带领某人参观某地

The guide conducted us around the history museum.

conduct a team 带领团队

He is a good manager who can conduct a team efficiently.

efficiently [ɪ'fɪʃ(ə)ntli] adv.有效率地；有效地；效率高地井井有条地

New words：

investigation /ɪnˌvestɪˈɡeɪʃn/ n.侦查；调查；

必记高频搭配

start an investigation (into sth)（对某事展开一次调查）
The teacher started an investigation into who lost the classroom key.

carry out an investigation（开展调查）
Scientists carry out an investigation into the rare animal.

conduct an investigation（进行调查，正式用法，写作加分）
The company conducted an investigation into the product problem.

conduct [ˈkɑnˌdʌkt] v.实施；执行；表现；引导