that your body uses for one purpose or another.

供给身体吸收支持身体机能运转
There are macronutrients and micronutrients and you've heard of both.

可以分为大量营养素和微量营养素两类
The macro nutrients are the big constituents of food,

大量营养素是食物重要组成来源
that's protein, carbohydrate, and fat.

即蛋白质碳水化合物和脂肪
I'll talk today about protein and then next week, or next class,

我们会在今天讨论蛋白质
we'll talk in more detail about carbohydrate and fat.

下节课进一步解释碳水化合物和脂肪
All are extremely important to the diets of Americans

它们对美国人的日常饮食都至关重要
and diets anywhere in the world and are very interesting.

甚至对全世界都非常重要非常有趣
The micronutrients, which are available in food but in smaller amounts,

微量营养素在膳食中所占比重较小
are vitamins, minerals, and water.

它们是维生素矿物质和水
The macronutrients, protein,

大量营养素蛋白质
carbohydrate and fat;

碳水化合物和脂肪