(比喻关系密切, 相互依靠) be as close as lips and teeth -- be closely related and mutually dependent;close interdependence;closely related and interdepended like lips and teeth;be closely related to each other like [as] lips and teeth ;

The interests of Hong Kong and the Motherland are intricately linked and intertwined.
香港与祖国一脉相连,唇齿相依.
来源:互联网摘选Interdependence like between lips and teeth is the best description of our relationship.
唇齿相依是对我们关系的最好形容.
来源:互联网摘选
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