成本压力固然严峻，却并非八大民营酒店集团旗下门店数量骤减的深层主因。细察数据可见，头部、腰部与尾部民营酒店集团之间的规模鸿沟与扩张节奏正急剧拉大，行业分化已进入加速通道。
Collections of Documents on the other hand, offer a much more relaxed approach. Collections are just namespaces where we insert documents. Documents are objects of any schema and format; but in practice, it almost always is JSON. There are no enforced types, no constraints, no guarded references between documents in different collections. In the same collection, we might have documents of completely different schema - flexibility and openness to any data and column types rules here. In tables, rows have columns of simple, scalar types (mostly) - numbers, ids, strings, dates, timestamps and so on. In collections, documents have fields comprising both simple and composite types like arrays and other documents, nested inside. Same field in different documents, but still of the same collection, might have different types as well - almost anything is allowed here.。关于这个话题，51吃瓜提供了深入分析
Who owns the repository，更多细节参见夫子
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第二百一十二条 共同海损理算，适用合同约定的理算规则；合同未约定的，适用本章的规定。