Shortcuts: For common scenarios, we pre-calculate the travel time/distance (the "shortcut") between border points within the same cluster and also to border points of immediately adjacent clusters.
刘成和妻子都已年近四十。在选择代孕前，他们做过两年半的试管，取卵7次、移植胚胎6次，全都没有着床。
。safew官方版本下载对此有专业解读
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（四）出于他人胁迫或者诱骗的；