即使长时间暴露在极低的温度下，有些种子也能在三天内发芽。

Some seeds may germinate in three days even if they have been exposed to very low temperatures for a long time.

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事实上，种子不能长时间保持发芽的能力。

Actually, the seeds don't retain the power to germinate for very long.

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许多种子在发芽前需要一段时间来分层，并在低温下储存一段时间。

Many seeds require a period of stratification, exposure to low temperatures for some minimum period, before they will germinate.

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