The likelihood of a net fiscal drain from emigration is raised by the life-cycle patterns of public goods and migration. 公益设施和移民的生命周期模式，使得由出境移居而造成财政净流出的可能性增大了。
Thus every motion corresponding to any initial curve is no more than a sum of sinusoidal periodic modes. 这样，每一个对应于任一初始曲线的运动不外乎是正弦周期模式的和。
