non·cha·lance /ˌnɑnʃəˈlɑn(t)s; ˈnɑnʃəˌlɑn(t)s, lən(t)s/
漠不關心,無動於衷,若無其事
Non·cha·lance n. Indifference; carelessness; coolness.
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nonchalance
n : the trait of remaining calm and seeming not to care; a
casual lack of concern [syn: unconcern, indifference]