body back wall

基本解释

In the bulkhead cross section, with is called by the supporting soil body immediate contact's spot the wall back;
在挡土墙横断面中，与被支承土体直接接触的部位称为墙背；
The water discharge opening (2) is provided at the front, back, left or right side wall of the squatting pan body (1).
所述的排水口（2）开设在所述的蹲便器主体（1）的前方、后方、左侧或右侧侧壁。
ip.com
Damp toweling devices are respectively arranged on the upper end or the lower end of a steam bathing body (1) and the back lateral wall of an inner cavity of the steam bathing body (1).
是在蒸汽浴房体1上端部或下端部，以及其蒸汽浴房体1内腔的后侧壁上，分别设有搓澡装置。
ip.com