Listen to the original separate a pair of loudspeakers, less bass set off, out of sound would be so weak, dumb ugly!
原来单独听一对高音喇叭,少了低音的烘托,出来的声音竟会是如此的单薄,喑哑难听!
Asynchronous - the consumer USES a pair of threads to invoke the service; one thread sends the request, then a separate thread receives the response.
异步——使用者通过两个线程调用服务;一个线程发送请求,而另一个单独的线程接收响应。
While electricity exists as separate charges, like the plus and minus of a battery, magnets always come in a joined pair;
电可以作为分开的电荷存在,比如说电池的正极与负极,而磁则总是要成双成对地出现。
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