我们一直设法使用在任一点都可能工作的最简单的设计，并根据不断出现的实际情况改变这种设计。

We always try to use the simplest design that could possibly work at any point, changing it as we go to reflect emerging reality.

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军官们希望这种交接仍应根据实际情况决定而非日期。

Military officers want such transitions to be determined by conditions on the ground, not by a calendar.

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