即使我们对出兵参战一事作出了艰难的决定，我们还必须认真考虑我们如何参加作战。

Even as we make difficult decisions about going to war, we must also think clearly about how we fight it.

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例如，可以使用“参加研习班”用例作为基础来编写系统用户文档的“如何参加研习班”一节。

For example, the "how to enroll in a seminar" section of your system's user documentation could be written using the "enroll in seminar" use case as its base.

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已经50岁了，Barbie的脸仍然是整形手术的奇迹，她仿佛永远不会变老，她仍然像年轻人一样知道如何参加聚会。

At 50 Barbie will also be a marvel of plastic surgery and eternal youth. And she still knows how to party.

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