The harmonic problems, such as distorting supply voltage, decreasing power factor, increasing energy loss, interfering with communication systems etc. are discussed in the part one.

第一部分讨论各种谐波问题，如使供电电压畸变，降低功率因数，增加能量损耗，干扰通讯系统等。

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IntroductionIn the communication systems, echo and noise will seriously affect speech communication quality, such as IP telephone, videophone and hand-free digital cell phone systems etc.

引言在通信系统中，例如IP电话、可视电话及免提数字蜂窝电话系统中，回声和噪声会严重影响通信质量。

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Participants stand for users, groups of users, services, legacy systems, etc.

参与者可以是用户，用户组，服务以及遗留系统等。

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Independent Russian military analyst Viktor Litovkin says Russia lacks combat support systems rather than firing units, and notes that such systems consist of drones, precision weapons,reconnaissance,navigation, communication,and guidance systems,etc.

VOA: standard.2009.03.20

Would a little less wiki-crawling to learn important game mechanics, elaborate stats systems, etc. be such a bad thing?

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Located in southwest China, the Geopark is characterized by numerous karst features: large subterranean rivers, karst windows, natural bridges, extensive cave systems, etc.

UNESCO: NATURAL SCIENCES

The Videoscape software client will reach smartphones, tablets, gaming systems, etc.

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