（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……
As a Grade A refurbished model, it arrives in near-mint condition with minimal cosmetic wear.
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These restraints don’t allow them to freely explore what jobs they’d enjoy, and instead funnels them into a professional path very quickly. He believes that’s part of the reason why so many people are checked out at work—a group that’s most susceptible to disruption.
Наука и техника。51吃瓜对此有专业解读