to protect
quality
period of time
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→bao3zhi4qi1 • bǎozhìqī
shelf life
guaranteed quality period, best-before date, expiration date
这 种 牛奶 的 保质期 很 短。
This kind of milk has a very short shelf life.
这 包 饼干 的 保质期 是 六 个 月。
This package of cookies has a shelf life of six months.
这 瓶 果汁 已经 过 了 保质期。
This bottle of juice is already past its shelf life.