这个过程由 JVM 和操作系统协作完成，对开发者完全透明——你写的代码还是同步阻塞风格的，但底层已经变成了异步非阻塞。
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boolean canBlock;。91视频对此有专业解读
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In 1942, at the height of British industrial war mobilization, an unlikely cohort scavenged the nation’s coastline for a precious substance. Among them were researchers, lighthouse keepers, members of the Royal Air Force and the Junior Red Cross, plant collectors from the County Herb Committee, Scouts and Sea Scouts, schoolteachers and students. They were looking for fronds and tufts of seaweed containing agar, a complex polysaccharide that forms the rigid cell walls of certain red algae.