Long Polling: Also known as Asynchronous Polling, this method is a hybrid of pure server push and client pull.

长时间轮询：也就是所谓的异步轮询，这种方式是纯服务器端推送方式和客户端拉取方式的混合。

youdao

When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time.

音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。

youdao

It was simply a matter of attitude. As long as I strove to do what I wanted to do and be who I wanted to be, I had a future of wakefulness in a pure reality.

这只是简单的态度问题，只要我努力坚持做我想要做的事，成为我想要成为的人，在真实的世界里有一个明白的前程在等我。

youdao

The Merrill product, in contrast, yields a pure long-term gain or loss taxed at 15%.

FORBES: Another Option

Think of it this way, a few decades back it was prety much impossible to put your money in a find which had anything other than a pure long only strategy.

FORBES: George Soros Retires From Hedge Fund Management

To be sure, pure, all-optical networks are a long way off.

FORBES: Hooked on photonics