求翻译：Teach　your　teenager　that　the　family　phone　is　for　the　whole　family.　If　your　child　talks　onthe　familys　telephone　for　too　long,　tell　him　he　can　talk　for　15　minutes,　but　then　he　muststay　off　the　phone　for　at　least　an　equal　period　of　time.　This　not　only　frees　up　the　line　so　thatother　family　members　can　make　and　receive　call是什么意思？

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