vt.使变平；打倒
vi.变平
She used a rolling pin to flatten the pie dough . 她用擀面棍来擀平做馅饼的面团。
He was totally flattened by her sarcasm. 她说的挖苦话使他无地自容。
用作不及物动词 (vi.)The land flattens out near the coast. 海岸附近地势变得很平坦。
The graph flattens out gradually after a steep fall. 图表上的曲线突降之後逐渐趋於平稳。
