n.棘轮；棘齿
v.（使）渐进
=rachet.
A ratchet allows a heavy weight to be raised in short successive stages. 棘轮可在简短连续的步骤内就把一个重物抬高。
In a computer, the games are played 100 times, mimicking a ratchet with many teeth. 在计算机中，这个游戏进行100次，以模拟有许多齿的棘轮。
用作动词 (v.)Smoking and alcohol ratchet up the damage several more notches. 吸烟和喝酒加深了这种损伤。
