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Noun:
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German chemist who with Kirchhoff pioneered spectrum analysis but is remembered mainly for his invention of the Bunsen burner (1811-1899)
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a gas burner used in laboratories; has an air valve to regulate the mixture of gas and air
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大于方面獨家代理創做,受作品權保護區,商標侵權必究
海詞字典,十六年的品牌