Mercurial: The word mercurial refers to someone unpredictable, changeable, or who has rapidly shifting moods. Donald Trump has a mercurial nature. https://links.artisanenglish.jp/Mercurial 

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These podcasts and posts are created to help our students and anyone who wants to access them improve their English vocabulary. 

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Here is another term from today’s episode that may have been new to you. 

Poster child: a poster child is someone/something that's a good example of a quality or characteristic. Shohei Otani is the poster child of Japanese baseball. 

https://links.artisanenglish.jp/PosterChild 

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