These services are static, as they are known to the system.
这些服务是静态的，因为它们对系统来说都是已知的。
The exchange of goods or services where no money is paid. Also known as barter.
指不采用货币作为中介的商品或服务的交换。
PTV , also known as network TV, is based on IP protocol television services.
也叫网络电视，是指基于IP协议的电视广播服务。
Services, and always in good faith, timely, caring known in the industry.
服务，始终以诚信、及时、贴心著称于业内。
Services, and always in good faith, timely, caring known in the industry.
服务，始终以诚信、及时、贴心著称于业内。
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