Currency exchange rates are always subject to variation.

　　貨幣的兌換率始終波動。

　　This soup is a spicy variation on a traditional favourite.

　　這種湯是在一種受歡迎的傳統(tǒng)湯羹中加了香料。

　　The survey found a wide variation in the prices charged for canteen food.

　　這項(xiàng)調(diào)查發(fā)現(xiàn)不同的餐廳出售食物的價格存在很大的差別。