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液状疫苗通常非常娇气，需要持续冷藏保存，于是在从工厂到诊所的过程中，疫苗都被保存在低温运输系统中享受一流的待遇。
The liquid vaccines they require are often temperamental, needing constant refrigeration and thus what is known as a "cold chain" to keep them in tip-top condition as they move from factory to clinic.
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