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What is the unopened lid of Huiyuan Juice?

The bottle cap is connected with the small plastic ring below. According to the product introduction of Huiyuan Juice in official website, we can know that the juice products are packed in 7-layer compound aseptic packaging, which has strong oxygen resistance, light resistance and sealing. The unopened lid looks like a bottle cap and a small plastic ring under the bottle cap are connected together until the connection is broken.