百度了，没有明确定义
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来问问
This topic created in 3319 days ago, the information mentioned may be changed or developed.
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zzzzzdai Aug 16, 2017 via iPhone
就像你用联通手机打电信号，中间存在着联通和电信如何分摊这笔话费的问题。
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caoxisheng5120 OP @zzzzzdai 谢谢了
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