The free tier is ad-supported and places caps on the number of hours that music can be streamed and the number of times a song can be listened to each month.

免费服务含广告，且每月可以播放音乐的时间，以及同一首歌可以收听的次数都受到限制。

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In what seems to be a response, Amazon has made available a free AWS Usage Tier for new customers for one year.

似乎是作为对此的响应，Amazon为新用户提供一年的AWS免费使用方式。

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The database tier has to process transactions in an environment as near latency-free as possible.

数据库层必须尽可能没有延迟地处理环境中的事务。

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It even has a free tier so you can do development without raising any money.

FORBES: How To Build A $30M Startup Without Spending Any Of Your Money, In Your Spare Time

Cloud Player is available in a Free tier and a Premium tier.

ENGADGET: Amazon updates Cloud Player with 256 Kbps matched files, faster import, direct delivery (update: Roku, Sonos coming soon)

To help customers understand how this service can be used with their applications, AWS is providing a free tier of service, in which up to the first 20 minutes of content transcoded each month is provided free of charge.

ENGADGET: Amazon wants to make your hi-res videos mobile-friendly with Elastic Transcoder