保温

保温	bǎo wēn	to keep hot / heat preservation
保	Bǎo	Bulgaria (abbr. for 保加利亚)
保	bǎo	to defend; to protect; to keep / to guarantee; to ensure / (old) civil administration unit in the baojia 保甲 system
温	Wēn	surname Wen
温	wēn	warm; lukewarm / to warm up / (bound form) temperature / (bound form) mild; soft; tender / to review (a lesson etc) / (TCM) fever / epidemic; pestilence (old variant of 瘟)