水平投影面 meaning in English

horizontal plane
horizontal projection plane

The base area of the building is to show level of periphery of above of plinth of building ground floor is umbriferous area
房屋的基底面积是指建筑物底层勒脚以上外围水平投影面积。
Mutual floor area still includes to cover with the midfeather between public construction , and outside wall ( include frontispiece ) the level is umbriferous the floor area of area half
共有建筑面积还包括套与公共建筑之间的分隔墙，以及外墙（包括山墙）水平投影面积一半的建筑面积。
Share the content of the area to include : path of elevator well , conduit well , stair well , rubbish , change between electric room , equipment , communal hallway , corridor , basement , be on duty gatehouse , and what serve for whole is communal the floor area that uses a room with room and management , with the level umbriferous area is calculated
共有面积的内容包括：电梯井、管道井、楼梯间、垃圾道、变电室、设备间、公共门厅、过道、地下室、值班警卫室等，以及为整幢服务的公共用房和治理用房的建筑面积，以水平投影面积计算。