调档 meaning in Chinese

transfer the files; examine sb.'s record [dossier]

Players use the direction keys to control vehicle operations , accelerate , is the brake , key counterparts around both sides of mobile , key adjusting the same time , the left side of the screen indicated that the present stalls , most under the r , ie reversing
玩家使用方向键控制车辆运行， “上”是加速， “下”是刹车，左右键对应两侧移动， “下”键同时可以调档，画面左侧表示目前档位，最下的“ r ”即为倒车。