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.
Flex Builder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.
Flex SDK可以免费下载和使用，而Flash Builder却只提供试用，需要用户购买。
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