未黄油的保质期大约3个月内冷藏，因为它不含有防腐剂。
Unsalted butter has a shelf life of around 3 months refrigerated because it contains no preservatives.
例如，过滤可用于除去未溶解的颗粒物样品，或者样品需要避光，或者需要冷藏贮存样品。
For example, filtration may be used to removeundissolved particulate matter, or samples may need to be protected fromexposure to light or may need refrigerated storage.
为确保安全卫生，请使用干净容器冲泡，未食用完的奶液请冷藏保存，并请于24小时内食用完毕。
For ensuring safety and health, please use the clean containers to brew, please keep the rest milk in cold storage and finish it in 24 hours .
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