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На шее Трампа заметили странное пятно во время выступления в Белом доме23:05
。体育直播是该领域的重要参考
刘成的女儿早产，曾住进保温箱十天，出院后又因黄疸、肺部发育不良持续随访。儿童保健时，被检出患有先天性心脏病。没有户口，孩子无法办理医保，也无法购买商业保险，看病只能全额自费。
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.