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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