一件商品的互补品价格上涨会增加了对于该商品的需求，相反的，一件商品的互补品价格下降会减少该商品的需求。
An increase in the price of a substitute increasesthe demand for a good, and conversely, a decrease in the price of a substitutedecreases demand for a good.
需求和偏好系统是互补的，前者促进我们行动而后者带给我们满足的间歇。
Wanting and liking are complementary. The former catalyzes us to action; the latter brings us to a satisfied pause.
中国对自然资源的需求不断增长，正好与非洲的丰富且往往开发不足的石油矿产储藏互补。
China's growing demand for natural resources is matched by Africa's significant and often under-developed oil and mineral reserves.
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