Keep frozen foods frozen to maintain quality, as bacteria will begin to multiply when the food is thawed.

使冷冻食品保持结冰而维持质量，这是因为当时食品解冻时，细菌将会开始成倍增长。

youdao

Researchers then injected the mice with samples of fresh and frozen human feces, the bacteria from which actually took hold and colonized in the gut of the mice.

之后研究者将冷藏的新鲜人类排泄物接种到小鼠中，并观测到这些来自于人类肠道的菌类能够小鼠肠道中繁殖。

youdao

The frozen food must be thawed when it is examined in terms of bacteria.

冷冻食品在细菌检验时，须进行解冻处理。

youdao

But bacteria on the surface of cuts of frozen beef are almost always killed by cooking, she said.

CNN: South Korea finds some U.S. beef tainted