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

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