Urban contacts are becoming close and presenting the characteristic of network along with the improvement of the techniques, traffic and communication.

随着科技水平的提高，交通、通讯条件的改善，城市联系愈来愈密切，并呈现出网络化的特征。

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Law enforcement has also become more sophisticated in dealing with child-abuse cases, including refining techniques for interviewing children and using social media to determine whether suspects have established contacts with alleged abuse victims, said Scott Burns, executive director of the National District Attorneys Association.

WSJ: Penn State Case Underscores How Society Deals With Sexual Assault