It's for free, because your computers are still in the period of guarantee — two years.

我们的电脑保修期是两年，保修期内维修都是免费的。

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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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The maximum amount guarantee is a special one with a special calculation of its guarantee period.

最高额保证是一种特殊的保证，其保证期间的确定也有其特殊性。

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"There is no way in this modern world that you can guarantee a job for any period of time in any part of the world, " he told me.

CNN: 'THE PEOPLE'S ASPIRATION'

Seven letter bombs were sent over a period of three weeks and the police have warned that they cannot guarantee that there will not be another one.

BBC: NEWS | UK | Letter bomb suspect is arrested

The Scottish government guarantees that cancer patients will be treated within 31 days of diagnosis, but this guarantee only covers the period until a patient has had surgery.

BBC: Months-long wait for radiotherapy at Inverness hospital