1.The body needs them to help break down food, and to grow, and repair tissue.
break down 分解;发生故障;失败;毁掉;制服
Their car broke down.
他们的车抛锚了 。
Over time, the protein in the eggshell breaks down into its constituent amino acids.
随着时间的推移,蛋壳中的蛋白质分解成其构成成分氨基酸 。