https://physics.stackexchange.com/questions/31326/is-a-hard-drive-heavier-when-it-is-full
System.out.println(" async task on: " + Thread.currentThread().getName());，详情可参考快连官网
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Storeton Wood, Wirral: Two centuries ago, this landscape was being transformed by George Stephenson as he built Liverpool; more than 200m years ago very different creatures roamed here
But it's also possible to modularise something without hiding any implementation details from other mdoules that want to connect to it.