The technical preview events only support sending events synchronously to the event server, using an EJB interface.

技术预览版事件只支持通过 EJB 接口同步的向事件服务器发送事件。

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Another problem is the print preview window, where each program is again responsible for providing its own support for print preview.

另外一个问题是打印预览窗口，每个程序都需要独自提供对打印预览的支持。

youdao

With the third platform preview, we introduce support for the HTML5 Canvas element.

与平台预览第三版一起，我们引入了对HTML5 Canvas元素的支持。

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As of now, the Ubuntu touch dev preview contains the shell, core applications, WiFi networking, support for front- and rear-facing cameras and Android Developer Bridge tool connectivity.

ENGADGET: Ubuntu Touch Developer Preview now available for supported Nexus devices

The Preview SDK, which currently supports phone app development, will now be updated to support tablet apps as well.

ENGADGET: Ubuntu for tablets revealed with split screen multi-tasking, preview for Nexus slates coming this week