（3）50ms 后，sleep 结束，JVM 把虚拟线程重新挂到某个空闲的载体线程上，继续执行后面的 getOrderFromDb()，然后又遇到 sleep，再次卸载……
The trajectory doesn’t stop there. By 2047, CBO projects interest costs will exceed even Social Security spending, ascending to become the single largest line item in the entire federal budget — larger than retirement income, larger than health care for seniors, larger than the military.
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