reverse/reversible

reverse /ri:ˈvə:s/ I. vt. 1. 颠倒，倒转：reverse the order of importance 主次颠倒；reverse a procedure 颠倒程序；reverse an engine 开倒车 2.取消，废弃：reverse a decision 取消一项决定； reverse outdated regulations and customs 废除陈规旧习 ‖II. n. 1.［u］倒挡位置: Put the handle to the reverse. 将手柄推到倒挡位置。 2.［u］相反，反向: His opinion is the reverse of favourable. 他不赞成。in reverse 相反（方向、顺序等）：a locomotive moving in reverse 一辆正在后退的火车头To stop the engine, you repeat the same procedures, but in reverse (order).要停止引擎就重复相同的程序，但顺序要倒过来。 3.［c］反面: the reverse of a coin 硬币的反面 ‖III. adj. 相反的，倒转的：in the reverse direction 往相反方向；a reverse transformation 相反的转化；the reverse current 反向电流

 reversible /ri:ˈvə:sibl/ adj. 可逆的，反向的：a reversible chemical reaction可逆的化学反应The rug is reversible.这地毯两面可用。The operation is easily reversible.这一操作可以轻易地反向进行。