Since 1997, I have been part of a successful conversational English training program, Patrick English Network (PEN).
自从1997年来，我一直参与做一个很成功的张士柏英语网(PEN)的项目——对话英语培训课程。
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The current channel is set by the calling program or transaction by issuing a LINK, XCTL, START and pseudo-conversational RETURN with the channel parameter.