以液氮超低温保藏最理想，酵母细胞存活率较高；
The yeast cells might as well be stored ultralow temperature by liquid nitrogen for higher survival rate;
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他们还把它放在低温下保藏。
They also keep well at low room temperatures.
低温冷冻是保藏食品最简便的办法。
Deep freezing is the simplest way of preserving food.
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