Without information on what the distribution of lock times will be for a given application, most JVMs are conservative and simply suspend a thread when it fails to acquire a lock.
由于没有指定应用程序的锁定时间分布信息，所以多数 JVM 采取保守策略，在得不到锁的时候只是暂挂线程。
Persevere USES continuations to suspend and resume execution so that asynchronous requests are made to retrieve data from the server (so the browser doesn't lock up because of synchronous requests).
Persevere使用延续(continuation)来挂起和继续执行，以便能够发起异步请求从服务器检索数据(这样一来，浏览器就不会由于同步请求而锁定)。
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