In either case, the inner container is used to obtain the key-to-data value mapping.

在这两种情况下，内层容器都用于获得键到数据值的映射。

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When the double-door milk box with a lift inner container is used, the milk sender can open all milk boxes with one general-purpose key without taking along with a plurality of keys.

采用这种牛奶箱时，送奶员只需配备一把通用钥匙便可开启所有奶箱，无须携带大量钥匙。

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The present invention can make foamed heating layer around the inner container in proper thickness, and has simple making process, high production efficiency and lowered cost.

发泡 模具的大小可随产品需要随意调整，发泡保温层的厚度随着发泡模具的大小 而变化。本制作方法能简化制作流程，提高了生产效率，并且降低了成本。

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