在线词典踏空亦作"蹋空"; 腾空而行; 踏物升空; 足底落空; 虚空,不切实。拼音tà kōng解释亦作"蹋空"; 腾空而行; 踏物升空; 足底落空; 虚空,不切实。英文释义to miss one's step; (of an investor) to fail to invest before the price rises