Pointing at a large concrete building in central Zlitan, the man added: "They have a close watch on all our movements."

这位人士指着位于利坦中心的一幢大型混凝土建筑说，“他们对我们的一举一动了如指掌。”

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Probably the most obvious way humans are altering the planet is by building cities, which are essentially vast stretches of man-made materials-steel, glass, concrete, and brick.

可能最明显的人类对这个星球的影响是城市的建设，这种建设需要人类生产制造的材料如钢铁，玻璃，混凝土，砖头等等修造的巨大的结构框架。

youdao

They worked with hand trowels, a plywood form for lining the shaft with concrete, inch by inch, and a sturdy hand-built crank for lowering a man to the bottom and sending up buckets of sand.

他们的作业工具是：挖土用的手工泥铲、浇筑混凝土井壁用的胶合板模板、还有手工制作摇杆。 摇杆将一个人送到井底，那个人就在井底一点点挖土然后再通过摇杆把沙子一桶桶送到地面。

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If Sartre thought that man was defined by his actions, Lanzmann was, in the most concrete way, a man of action.

NEWYORKER: Witness

The body of a man found dead in a concrete mixer 10 years ago has been exhumed.

BBC: Exhumation of Lee Balkwell in concrete mixer death probe

Someone who knows all too well what Ethan may go through is Katie Beers, who as a 10-year-old was held underground in a concrete bunker for two weeks by a New York man.

CNN: FBI: Bombs found in Alabama kidnapper's bunker