建筑外立面在英语中可以称作 "building façade" 或 "exterior wall"。

"Façade" 来源于法语,意思是 "外表、外观",在建筑中指的是建筑物正面的外立面。

例句:

The building façade is made of glass, steel, and concrete. (这座建筑的外立面由玻璃、钢材和混凝土构成。)
The architect designed the building façade to be energy-efficient. (建筑师设计这座建筑的外立面具有节能性。)

"Exterior wall" 意思是 "外墙",在建筑中指的是建筑物外侧的墙壁。

例句:

The exterior wall is made of brick and covered with a layer of stucco. (这面外墙是由砖制成的,并覆盖有一层灰泥。)
The exterior wall is insulated to keep the building warm in winter. (这面外墙有隔热层,可以让建筑在冬天保持温暖。)