You do fractions , then you do decimals .

你先学习分数，然后，学习小数。

Unlike the industrial hydrogen used to make ammonia fertiliser , or for converting heavy oil fractions into petrol , the hydrogen needed for fuel cells must be 99.999 % pure .

与制造氨肥或将重油馏分转化为汽油用的工业氢气不同，燃料电池所用氢气纯度须达到99.999%。

Fractions let you divide up a measure of music into notes of varying length .

从分数的概念来看，一段音乐可分成几串长短不一的音符。

Measuring ingredients teaches kids about fractions .

称量食材能教他们学习分数。

Baking in the kitchen , ms. cameron explains fractions while having each of her children crack half the eggs .

在厨房烘焙糕点时，卡梅隆让两个孩子将鸡蛋敲开一分为二，在这个过程中，她向孩子解释了分数的概念。