接替
to replace; to take over (a position or post)
解题
to solve problems; to explicate
解体
to break up into components; to disintegrate; to collapse; to crumble
阶梯
flight of steps; (fig.) a means of advancement; stepping stone
借题发挥
to use the current topic to put over one's own ideas; to use sth as a pretext to make a fuss
阶梯计价
volumetric pricing; tiered pricing; differential pricing