我们已详细地谈论关于负面和正面极化，如同服务自我和服务他人。
We have spoken at length about negative and positive polarity as service to self and service to others.
我们已经详细地谈论过这个，而且我相信去年当我们在这里时，关于它我们讨论一些。
We have talked about this at length, and I believe we spoke about it a bit last year when we were here.
在第2部分谈论有关JJTree工具和解析树表示时，我将回过头来更详细地讨论这一内容。
I'll come back to this in more detail when I talk about the JJTree tool and parse tree representations in Part 2.
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