You can achieve greater flexibility, adaptability, and independence when each layer is only loosely coupled to the layer above and below.
当每个层仅松散耦合到其上和其下的层时，您可以实现更强的灵活性、适应性和独立性。
Applications that interact via messages have the advantage of being loosely coupled, because changes in one system have no impact on the other as long as both sides agree to the same message format.
