展開 zhǎnkāi HSK3 to unfold Origin Definitions Defs Strokes Stroke Words Sentences Sents 展开图 zhǎnkāitú net a two-dimensional pattern that can be folded to form a three-dimensional solid or surface建筑展开面积 jiànzhùzhǎnkāimiànjī floor space total built-up area of a building including all floors微扰展开 wēirǎozhǎnkāi perturbative expansion perturbative expansion (physics)