to protect
quality
period of time
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→bao3zhi2qi2 • bǎozhíqí
shelf life
guaranteed quality period, best-before date, expiration date
This term is especially common in Mainland usage; in Taiwan, 保存期限 is more usual.
這 種 牛奶 的 保質期 很 短。
This kind of milk has a very short shelf life.
這 包 餅乾 的 保質期 是 六 個 月。
This package of cookies has a shelf life of six months.
這 瓶 果汁 已經 過 了 保質期。
This bottle of juice is already past its shelf life.