This may sound simple if it is a feature of the main version of the application.

如果这是应用主版本的功能，就很简单了。

youdao

"Our main version is a spontaneous move by the stabiliser into an extreme position that caused the plane to make a steep climb at high speed, " Mr Chernov told Russian NTV television.

BBC: Moscow crash jet 'stabiliser jammed'

Loyalty cards are the Main Street version of requiring you to log in and provide a password for every website that needs to know you.

WSJ: The Customer as a God: The Future of Shopping

Also like the main Android version, there's a so-called CD Listening Party feature that opens up free, complete albums, with selections changing weekly. (Naturally, you can also use the app to listen to your own MP3s stored locally on the device, but you probably gathered that.) Play will be available as a free, ad-supported app, though you can also get an advert-free version for 99 cents.

ENGADGET: AOL redesigns its Play music player app for the Kindle Fire, premium version is free Thursday