Supposing that yin-yang is a pair of interacting variables, the yin-yang equation is established.
把阴阳视作一对相互作用的变量，建立起阴阳方程。
In this case, the interacting variables of protein level, amino acid composition, digestibility, and absorption of the amino acids all contribute to determine biological value.
此时，蛋白质含量，氨基酸组成，消化性能以及氨基酸吸收之间的相互作用均会影响生物学价值的测定。
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