"Too much cross linking reduces elasticity and makes the skin stiff and rigid, and these are the conditions that encourage wrinkled skin," Werman said in a statement.
沃曼在一次报告中说：“太多的交叉相联'就会使皮肤降低弹性，发生硬化，这是导致皮肤起皱纹的原因。”
2
Complementary goods have a negative crosselasticity of demand.
互补商品的需求的交叉弹性为负数。
3
The demand is affected by price and income, classified as price elasticity of demand, income elasticity of demand and crosselasticity of demand.