Demographers try to predict social fluidity.

人口统计学家试图预测社会流动性。

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Large public activity has the character of big population density and strong fluidity, which is liable to safety accident and causes big casualties and social impacts.

大型公共活动人口密度大、流动性强，极易引发安全事故，造成大量人员伤亡和恶劣社会影响。

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While this is new ground for the AACC Annual Scientific Meeting, we must be adaptable to the fluidity between social media platforms and digital technology.

这是AACC年度会议新的里程碑，我们必须适应社交媒体平台和数字化技术之间的流动性。

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While this is new ground for the AACC Annual Scientific Meeting, we must be adaptable to the fluidity between social media platforms and digital technology.

这是AACC年度会议新的里程碑，我们必须适应社交媒体平台和数字化技术之间的流动性。

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