In the traditional polling method, the client sends a request to the server and always either gets an immediate response if the server has any updated data, or a no-data-available response.

在传统的轮询方法中，客户机发送一个请求到服务器，然后总是可以收到一个即时响应(如果服务器有更新数据)或者一个“无可用数据”的响应。

youdao

No data entry directly USES an abstract class.

没有数据条目会直接使用抽象类。

youdao

No data are available for Tuvalu.

没有图瓦卢的森林覆盖数据。

youdao

Karen Miller Kovach , its chief scientist, says the decision was made because there's no long-term data to show that weight-loss programs for children work.

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Nissen then walked through a series of slides arguing diabetes drugs are approved with almost no long-term data in patients with heart disease--even though, after approval, heart patients get the drugs for a long time.

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Selling off-the-shelf reports wouldn't work--no one wanted the same data everyone else had--and neither would competing on price.

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