For music firms that have been quietly negotiating with Apple and Google, which want to build locker services of their own, Amazon's tactics are below the belt.

苹果与谷歌也企图打造自己的“寄存柜”服务，音乐公司一直在默默与之谈判，故对其而言，亚马逊的手段有欠正当。

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Dropbox lets users store digital files — photos, personal documents, music — in an electronic locker that the owner can access or share on nearly any Net-connected device.

Dropbox允许用户在“电子存储箱”里存放图片、个人文档、音乐等数码文件，用户几乎可以通过任何互联网设备访问和分享这些文件。

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Apple's iCloud is not just a storage locker for music.

苹果的iCloud并不仅仅是音乐的储藏盒。

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Then there is the fact that Google's fledgling music locker still requires users to upload songs to it manually.

ECONOMIST: The web giant launches a rival to Apple��s iTunes

Last week's Switched On discussed Lala.com's introduction of free music locker services that sync directly to the iPod (and only the iPod).

ENGADGET: Switched On: I'm in ur site, hearing ur t00nz

Google's music locker is currently free, but limited to 20, 000 songs.

WSJ: Apple's Music Service Stores All Your Songs Without Alot of Slow Uploads