gradationally
adv. 逐渐地，渐变地：以逐步的方式或程度变化。
例句
The rolling pressure is exerted gradationally whereas the rolling process is divided into three steps, namely, rolling orientation, rolling reinforcement and rolling smoothing;
滚压力分级施压，滚压分为定位滚压、强化滚压、光整滚压三过程；
