The researchers also found that loneliness spread more easily among women than men.

VOA: special.2009.12.22

This was why Christianity and other things were able to spread so easily, why Paul was able to travel around the empire.

所以基督教及其他信息,能传播地如此迅速，所以保罗能够周游帝国。

耶鲁公开课 - 新约课程节选

Disease experts worry that H1N1 could spread easily in the crowds.

VOA: special.2009.11.11