If such classes are not available at runtime, it'll throw that exception.

如果这样的类在运行时不可用，它会抛出该异常。

youdao

Available microwave switch configurations include a simple single-pole double throw (SPDT) switch, multi-position switch, matrix, and cascade.

可用的微波开关配置包括简单的单刀双掷(SPDT)开关、多位置开关、矩阵和级联开关。

youdao

The app makes it easy to throw in photos and video, and to set your status so people know if you're available.

这款应用程序令照片和视频分享变得很简便，另外，设置自己的状态也很容易，这样别人就知道你是否有空了。

youdao

We could go on and on about the new software, but it's available for download at the source link below, so run along and throw your own virtual cupcake party!

ENGADGET: Skype 5.0 Beta for Mac finally available, includes group video calling

With Google's voice assistant now available on iPhones and iPads, The Associated Press used an iPad Mini to throw five test questions at Google Now and Siri on Monday afternoon in New York.

NPR: How Siri, Google Now Respond To 5 Questions