（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……
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Mars missions need medical facilities handling expected issues (fractures, vision loss, burns, cancer) and unexpected illnesses. Though spacecraft seem infection-free, immunity changes in space can reactivate viruses. Crews coexist with evolving microbes in a high-radiation environment.