酸根

酸根	suān gēn	negative ion / acid radical
酸	suān	sour / tart / sick at heart / grieved / sore / aching / pedantic / impractical / to make sarcastic remarks about sb / an acid
根	gēn	root / basis / classifier for long slender objects, e.g. cigarettes, guitar strings / CL:条 / radical (chemistry)