New words：

composition [ˌkɒmpəˈzɪʃ(ə)n] n.成分；作文；构成；作品

Sample Sentences：

Scientists are studying the composition of the air in big cities.
We have to write a composition about our dreams every month.
They analyzed the composition of the medicine to see if it was safe.
The famous musician is good at composition and has created many wonderful songs.

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