These are pre-beta versions, not suitable for production use.

这些都是预先测试版本，不适合生产使用。

youdao

Right now, that means that you have to use special pre-release versions, because it’s not even in beta yet.

现在，这意味着你必须使用特殊的预览发布版本，因为它甚至还不是测试版。

youdao

We've been tracking the progress of Fennec since its first prototype in April 2008, to the launch of the pre-alpha version in February this year, and the recent launch of the first beta in mid-March.

我们一直在跟踪Fennec的开发进度，去年4月推出首个产品原型，今年2月推出测试前预览版，3月中旬推出首个测试版。

youdao

Holt notes that the company issued a pre-beta version of Office 15 in January, with a more streamlined user interface and touch-0centric features.

FORBES: Microsoft: Morgan Stanley Bullish On Office 15; Target $37

We'd already gotten the official word that H.264 support was included in Windows 7, but a tipster has lead us to believe that the pre-beta version of Windows 7 also includes native support for DivX.

ENGADGET: Windows 7 to natively support DivX and transcoding? HD

Though we were originally told in January that we could expect Android and iOS versions of the browser sometime this month, representatives at the company's booth at MWC noted that what we're seeing is actually a pre-beta version and the final product is "coming soon" with no specific timetable given.

ENGADGET