However, food boxes' position with respect to the surroundings could be changed by revolving either the inner cage containing the birds or the outer walls, which served as the background.

但是，通过旋转鸟笼内部（鸟在里面）或者旋转充当背景的外墙，餐盒与周围环境的相对位置可能会发生改变。

youdao

Even from the outer walls there was much artwork to admire.

甚至从外墙开始就有很多艺术品值得赞美。

youdao

David worked in an oven factory. The outer walls of the factory were painted blue.

戴维在一家炉厂工作。工厂外部的墙被漆成了蓝色。

youdao

But too often their cry for help has sounded hopelessly against the outer walls, while others -- less deserving -- find easy entrance to the halls of Congress.

VOA: special.2010.06.24

"Many political artistic statements can be seen on the outer walls, particularly between Hangars 2 and 3".

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The outer walls of the buildings were decorated with red tiles and the security bars were painted yellow.

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The site is impressive: the outer walls enclose an area of several hundred square metres.

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