可开启的窗户让使用者对他们的室内环境可进行直接操控。
Operable Windows allow users to have direct control of their interior environment.
比如，瑞士再保险公司如果为设在伦敦的总部新大楼安装可开启的窗户，会产生额外的高成本，虽然能够降低空气流通费用，但要十年以上才能与投入相抵。
For example, Swiss re's installation of Windows that can be opened in its striking new London headquarters will take more than a decade of reduced ventilation bills to justify their extra cost.
南立面与外界隔绝，建筑师设计了一条窗户可开启的走廊来进行交叉通风。建筑内没有空调系统。
The south facade is isolated from the outside, and a corridor of operable windows is created to generate cross ventilation. There are no air conditioning systems.
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