对分层结构的支持很弱：ATOM数据模型并不直接支持嵌套和分层。

Poor support for hierarchy: The Atom data model is that it doesn't directly support nesting or hierarchies.

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纸蜂窝板的悬挂用的是普通吊顶采用的带螺纹的钢筋吊杆，它是异形分层隔板的最直接的结构搭接方式。

Screw steel bars are used to suspend the beehive paper panels, because they are the most direct way of structural connection of layered special section panels.

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重点讨论了分层分布式安全监测系统的结构：基本监测控制层(BMC层)；直接数据控制层(DDC层)和监测控制管理层(MCM层)。

Deals with multilayer distributed system construction, discussed Basic Monitor Control layer (BMC layer), Deriction Data Control layer (DDC layer), Monitor Control and Management layer (MCM layer).

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