duration of validity

英 [djuˈreɪʃn ɒv vəˈlɪdəti]

美 [duˈreɪʃn əv vəˈlɪdəti]

有效期（间）

The Ministry of Commerce, within 30 days after receipt of all the above-mentioned documents, shall give the official reply, the duration of validity of which is 180 days.
商务部收到上述全部文件后应在30日内作出原则批复，原则批复有效期180日。
This paper describes studies on stability of the dilution of lugol's solution in glass vial and plastic vial. The result showed the duration of validity of the medicine in glass vial was 21 days and in plastic vial 1.6 days.
本文报告了复方碘溶液稀释液在玻璃瓶及塑料瓶内稳定性的研究，结果有效期在玻璃瓶内为21天，塑料瓶内为1.6天。
Major indices include reserve, remaining oil, recovery, cementing quality, incremental oil from measures taken, revenue from measures, measure increment input& output ratio, valid period of measures, duration of investment return of measures, validity of measures and economic efficiency, etc.
主要指标有储量、剩余油、采出程度、固井质量；措施增油量、措施收益、措施增量投入产出比、措施有效期、措施投入回收期、措施有效率和经济有效率等。