乔治在其最近出版的《真北团队》(True North Groups)一书中指出，美国人的社交活动越来越少。

Americans have become less social, George argues in his recently published book True North Groups.

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雷达转换至真运动北向上。

Change radar to true motion north-up.

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雷达转换至真运动北向上。

Change radar to true motion north-up.

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