ration
词根词缀：
ratify v. 证实
rat 计算 + ify 使… → 通过计算证实 → 证实
ration n. 定量
rat 计算 + ion 表名词 → 计算出来的量 → 定量
rational adj. 合理的
ration 定量 + al …的，具有…性质的 → 通过计算来定量 → 合理的
rationality n. 合理性
rational 合理的 + ity 具备某种性质，状况 → 合理性
数据来源：新东方英语词汇速记大全
相关例句：
Mash and grain ration feeding system Molasses is not an easy ingredient to mix into concentrated feeds.
糖蜜作为一种饲料成分与精料混合并不容易。
Are the ration tickets more important than your life?
配给票就比你的生命更重要吗？
In my opinion, we must try to ration gas and electricity.
依我看，我们必须实行煤气、电力的限量配给。
Aid officials said that the first emergency food rations of wheat and oil were handed out here last month
救助官员说第一批紧急援助的小麦和食用油是上月发放到这里的。
If your rabbit happens to like carrots, you have to carefully ration the stuff.
如果碰巧你的兔子喜欢吃胡萝卜，那你就要小心给它定好分量了。
The Research and Development on Universal Material Ration System
材料定额系统的通用化研究与开发