研究人员担心，如果没有某种形式的干预，大量在美国长大的黑人和拉美裔儿童会超重或肥胖，其生命将更短暂、更悲惨。
Without some form of intervention, researchers worry, large Numbers of black and Hispanic children in the United States will grow up overweight or obese and lead shorter, less fulfilling lives.
本节课我们将会了解把一些长的单词或者一组单词变成一种更短更简洁的形式，这种形式就称为缩写词。
In this lesson we will take a look at what happens when we want to make a long word or a group of words into a smaller and easier to remember form. Or as it is more commonly known... Abbreviation.
本节课我们将会了解把一些长的单词或者一组单词变成一种更短更简洁的形式，这种形式就称为缩写词。
In this lesson we will take a look at what happens when we want to make a long word or a group of words into a smaller and easier to remember form. Or as it is more commonly known... Abbreviation.
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