James Mattis once served as US Secretary of Defense.
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culture
The Chinese press most commonly attaches 马西斯 / 马蒂斯 to the surname Mathis (French), Mathys, or sometimes Mattis. James Mattis (US general and Trump's first SecDef) is more often rendered 马蒂斯, but 马西斯 also appears for him in some outlets.