保用期多久？
保证期多久？
这部机器的担保期有多久？
无火香薰挥发精油的保质期是多久？存放条件怎样？
How long does the Aroma Reed Diffuser Oil last? How do I storage it?
哇！这真是天大的好消息。那个杂志多久出一期？
Wow! That's really great news. How often does the magazine come out?
哇！这真是好消息。这杂志多久出一期？
Wow! That's really great news. How often does the magazine come out?
你的交货期是多久？
这个微波炉的保修期是多久？
购买者期望你们产品的使用期是多久呢？
这真是好消息。这杂志多久出一期？
That's really great news. How often does the magazine come out?
这真是好消息。这杂志多久出一期？
That's really great news. How often does the magazine come out?
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