Rooms open onto the patio, where all kinds of domestic activities take place.

房间都通向天井，各种家庭活动都在这里进行。

youdao

The two halls open onto each other.

这两个大厅有门相通。

《新英汉大辞典》

Some are deep and water filled, some open onto hidden rooms.

一些很深，里面积有水；有些开在密室的顶上。

youdao