- 重点词汇
- 国外
overseas; foreign; abroad
- 网络电话
voice over broadband; Internet Protocol (IP) telephone; Internet phone; Voice over Internet Protocol (VoIP)
- 呼叫
call out; call; shout; cry; page; call upon; appeal to; exclaim; clamour
- 软件
software
- 免费
free; complimentary; gratis; courtesy; be free of charge; cost free; cost a dime; cost a penny; for free; at no cost; without payment; grant free of charge