Currency exchange rates are always subject to variation.
货币的兑换率始終波动。
This soup is a spicy variation on a traditional favourite.
这种汤是在一种受欢迎的传统汤羹中加了香料。
The survey found a wide variation in the prices charged for canteen food.
这项调查发现不同的餐厅出售食物的价格存在很大的差别。