The passbook was replaced by plastic, so that today Americans are overwhelmed by debt and the national savings rate is calculated, like an algebra equation, in negatives.
后来存折被塑料卡片取代，因此，今天的美国人个个债台高筑，国民储蓄率以方程序计算呈现负增长。
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But the other half of the equation is Russia's plummeting birth rate, which in the past two decades has fallen from an average of two children per woman to barely more than one.
Using quadric regression design to establish regression equation of capsicum dehydration rate and drying quality, and then verified the equation's significance.