Generally speaking, enclosure walls of quadrangle dwellings and houses line along the street have no Windows to outside, yard's surrounding is closed and quiet.
四合院的围墙和临街的房屋一般不对外开窗，院中的环境封闭而幽静。
This system consists of an enclosure, closed in on three sides.
它由一个围壁组成，三边被封住。
Contacts on the filter unit and the field charging unit engage cooperating contacts on an enclosure mounted on the frame when the door is closed to supply electrical power.
当门关闭以供电时，过滤器单元和电场充电单元上的接触件配合安装在框架上的箱上的协配接触件。
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