At the same time, it is a "double-edged sword", has negative features.
同时，它又是“双刃剑”，具有负向功能。
The western postmodern art, which has its own positive and negative influences during the art history, has its own special background, features and functions.
西方后现代艺术有其独特的背景、特征和作用，在历史进程中有积极影响，也有消极影响。
Network has the features of openness, pluralism and initiation. Information network brings about not only positive impact to teen-agers, but also negative influence to them.
网络具有开放性、多元性、自主性的特点，信息网络对青少年产生积极影响的同时，也带来了消极影响。
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