私人电话线所连接的系统无法拨打或接听国际电话；国际电话线路只有在受到限制的场合下才会接通。
Private telephone lines operated on a system that precluded making or receiving international calls; international phone lines were available only under restricted circumstances.
质量差的电话线还会进一步降低传输速度，有些较陈旧的线路根本不能处理56k。
Poor telephone line quality can hamper transmission speed even further, and some older lines cannot handle 56K at all.
对测量的数据进行调制，通过载波线路或电话线进行远距离传输。
Also it can modulate measured data and perform remote transmission via carrier line and telephone wire.
而网络电话系统便无需如此高的成本：一台电脑就能够轻易地处理大量电话线和扩容 —只需为您的网络添购更多线路便能获得最佳的升级！
Not so with a VOIP phone system: a standard computer can easily handle a large number of phone lines and extensions – just add more phones to your network to expand!
而网络电话系统便无需如此高的成本：一台电脑就能够轻易地处理大量电话线和扩容 —只需为您的网络添购更多线路便能获得最佳的升级！
Not so with a VOIP phone system: a standard computer can easily handle a large number of phone lines and extensions – just add more phones to your network to expand!
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