菜单随季节而变动。
制糖业人士抱怨称，尽管乙醇价格随全球蔗糖需求情况会上涨或下跌，但是巴西汽油价格不会随石油价格变动立刻调整。
The sugar people complain that, although the price of ethanol rises and falls with world sugar demand, petrol prices in Brazil do not adjust quickly to changes in the oil price.
为了让这个场景有点儿难度，保险费不但每天变动，而且随价格变化。
To make it a little more challenging, the insurance not only varies on a daily basis but also changes with price.
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