◎ 对开 duìkāi

(1) [(of trains,buses,etc.) run from opposite directions]∶[车船等] 由两个地点相向行驶

(2) [folio]∶印刷上指相当于整张纸的一半

(3) [divide into halves;go fifty-fifty]∶对半分配,即双方各占一半