noun
a system of transporting and storing goods at low temperatures to maintain their quality and safety
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The pharmaceutical company invested in improving its cold chain to ensure the safe transport of vaccines.
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Make sure you pack the cooler properly to maintain the cold chain for the picnic.
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I always make sure to keep the cold chain unbroken when I'm transporting food.
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In order to maintain a healthy relationship, it's important to keep the communication channels open and not let the 'cold chain' develop.