Then, when you need new building blocks, or you need to release some energy, those polymers in your body, or new ones in your food, get broken up — by catabolic reactions.

然后，当你需要新的组成部分，或者你需要释放一些能量，你体内的聚合物，或者你食物中的新聚合物，都会被分解——通过分解代谢反应。

But for now, you've learned all about the vital nutrients — including water, vitamins, minerals, carbs, fats, and proteins — as well as how anabolic reactions build structures and require energy, while catabolic reactions tear things apart and release energy.

但是现在，你已经了解了所有重要的营养物质——包括水、维生素、矿物质、碳水化合物、脂肪和蛋白质——以及合成代谢反应如何构建结构和需要能量，而分解代谢反应将东西分开并释放能量。