In addition to the planned primary and secondary ventilation corridors, other smaller corridors will also be added to the system.
王说，除了规划主要和次级通风廊外，这个系统还包括其他小一点儿的通风廊。
The object was implemented in a low energy construction method with controlled ventilation (displacement ventilation in the classrooms) including the design for a natural secondary ventilation system.
其目标是采取一个能够控制通风的低能耗施工方法（在教室进行通风），包括自然二次通风系统的设计。
The secondary outcomes were duration of mechanical ventilation, occurrence of complications and survival to discharge from hospital.
次要评估指标为机械通气时间、并发症发生率和存活出院的患儿数。
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