Then put a general-purpose container figure like Panel on the canvas.

然后，将一个类似Panel 的通用容器图放在画布上。

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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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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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