The exterior walls were made of preformed concrete.

外墙是用预制混凝土建造的。

《柯林斯英汉双解大词典》

In the final step, heavily insulated exterior walls and windows are slotted in by crane.

最后一步，用起重机将高度隔热的外墙和窗户安装进去。

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When the tower was first constructed in 1962, the exterior walls were covered with thin square stones.

1962年，这座塔第一次修建，覆盖在外墙上的是薄薄的方形石头。

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In colder climates exterior walls will consist almost entirely of argon-filled thermopane glass.

FORBES: The House Goes Round

After the exterior walls are hung the house slides on rollers to another station where workers add interior walls, insulation and the roof.

FORBES: Magazine Article

The structure with thin concrete slabs at irregular heights and no exterior walls, leaving vehicles on open display is more than a place to stash cars.

WSJ: A Sleek, Chic Hangout ... the Parking Garage