Chitin has a tight connection with human life.

甲壳素与人类的生命有着密切的关系。

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There is a tight connection between healthcare buildings and people's lives.

医疗建筑与人类生活有着密切的关系。

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There is a tight connection between healthcare buildings and people's lives.

医疗建筑与人类生活有着密切的关系。

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