The school principal welcomed the students during morning assembly.
校长在晨会上欢迎学生。
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They found that the principal requirement for what is called " global cascades" — the widespread propagation of influence through networks — is the presence not of a few influentials but, rather, of a critical mass of easily influenced people.
他们发
,人们所说的 “全球连锁反应” ——
力通过(人际)网络进行广泛传播——发生的主要前提,并不取决于是否存在着那么几

者,而主要取决于易受
的人们是否达到了临界数量。