A close interdependence where the loss or harm of one party inevitably affects the other; if one falls, the other is in danger.
如果上游企业出现问题，下游企业也会立刻受到影响，这正是唇竭齿寒的关系。
If the upstream enterprises encounter problems, the downstream enterprises will immediately be affected; this is precisely a 'lips gone, teeth cold' relationship.
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