The concrete wall that used to divide this city has now all but gone.

这堵曾经被用来分隔这座城市的水泥墙现在差不多不存在了。

《柯林斯英汉双解大词典》

A forty-foot-high concrete wall encircles the jail.

一道40英尺高的水泥墙环绕着该监狱。

《柯林斯英汉双解大词典》

Later on, while I waited with hundreds of people to get on the D.C. Metro subway system, a friend and I looked through photos from the day by projecting the camera's images onto a concrete wall.

后来我跟几百个人一起等地铁时，一个朋友和我将照片投射到一面混凝土墙壁上，浏览了当天的照片。

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ConEd officials Tuesday showed a 5-foot tall concrete wall now standing in front of a structure that housed signal equipment, which was flooded during the storm.

WSJ: ConEd Storm Plan to Cost $1 Billion

Back when he was just a contractor in Saudi Arabia, he is said to have impressed impatient royal clients by wheeling in giant jet engines to blow-dry a concrete wall.

ECONOMIST: For now, at least

But GFP is a concrete wall of a molecule--it curves around itself such that there is no place for an enzyme to bind.

FORBES: Research