You need free time to watch birds, and money.
你需要自由的时间和金钱来观察鸟类。
It was very kind of you firefighters to spend your free time helping someone in need.
你们消防员太好了,把业余时间用来帮助有需要的人。
Building Flex applications can be free. All you need is the free, open source Flex SDK, which includes.
创建Flex应用程序可以是免费的。
You need the soul in order to explain free will.
那就是我们需要灵魂来解释自由意志
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