the friendship is the period of validity是什

the validity period的中文意思 请帮忙翻译一下：The validity period for this coupon is 30 days from 英语翻译Validity of bequestsWhere the essential validity of a wi but within the validity of the credit, 英语翻译整个句子是In a nuclear bomb,the period is of the order of nan the validity of the proposal is until Dec 31st,2009 and will 英语翻译The validity of remaining provisions of the contract sha the joys of friendship 英语翻译The periods of validity of operating measurements are no 英语翻译61.Adolescence is the period of transition between child the friendship stop time is the time of my heart Love is riding the line of fire of friendship.