What does 展开 (zhǎn kāi) mean in English?

Card 1198HSK 2010 Level 51198/1311
CARD1198
PROGRESS91%
展开
展開
zhǎn kāi
to unfold; to carry out; to be in full swing; to launch
Click to reveal
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Reveal: Click/Space/Enter/↑↓/w/s/j/k•Navigate: ←→/h/l/a/d