common social fluidity 共同社会流动模型
Demographers try to predict social fluidity.
人口统计学家试图预测社会流动性。
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。
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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