How long is the guarantee period?

保用期多久？

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How long is the guarantee period for this electronic book?

这本电子书的保证期多长？

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The reason why many seeds require a period of stratification is to guarantee that the seeds grow after and not before unfavorable weather.

许多种子需要一段时间分层的原因是为了保证种子在恶劣的天气来临之后而不是之前生长。

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Unfortunately, development of the new jammer coincides with a period when Pentagon investment in new technology is expected to decline markedly, so there is no guarantee the Next Generation Jammer will stay on track.

FORBES: In Digital Age, U.S. Military Still Stuck With Vietnam-Era Jammers