因此，这些社会特征有利于造就流浪在外并且大胆的移民，这些移民会一直向西迁移到比定居点更遥远的地方。

Therefore, these social traits helped to produce the nomadic and daring settlers who kept pushing westward beyond the fringes of settlement.

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而恶意软件们也追随着他们迁移——从电子邮件到社会化网络网站。

And malware threats have followed them - from email to social networking sites.

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城市化不仅是人口迁移、经济转型的过程，它还是一个社会文化转型的过程。

Being a process of migration and economic transformation, urbanization also witnesses the transformation of social culture.

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