1.  horizontally pivoted hung window
2.  center-pivoted window
3.  center-hung swivel window

• 1. 中悬窗: center-pivoted window | horizontally pivoted hung window
• 2. 中悬窗智能隐形开窗器: KCQZX
• 3. 中悬式天窗: horizontally pivoted skylight

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