prescription of an action 基本例句 时效 It is also required by OSS for an extension to your visa.学生服务办公室也同样有这样要求,以便延长您的签证时效。 The starting-point and duration-change of civil prescription in our country should be particularized and concrete.对于诉讼时效起算点和期间变动宜进一步具体化和细致化。