Flex Builder is a commercial product, but it has a long free trial period that will give you enough time to figure out if it's worth your money.
FlexBuilder是个商业产品，但它有很长的免费试用阶段，能让你有足够时间想清楚是不是值得掏这个钱。
The Flex SDK is free to download and use without cost, while Flash Builder is available as a trial download and requires purchase.
FlexSDK可以免费下载和使用，而FlashBuilder却只提供试用，需要用户购买。
The Flex SDK is free to download and use without cost, while Flash Builder is available as a trial download and requires purchase.
FlexSDK可以免费下载和使用，而FlashBuilder却只提供试用，需要用户购买。
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