The blocks should be laid on a bed of concrete.

石块应该固定在混凝土基座上。

《牛津词典》

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They had used almost four million cubic meters of concrete in the dam.

VOA: special.2009.08.12

It refers instead, to the concrete, collective, communal salvation from national suffering and oppression, particularly in the form of foreign rule or enslavement.

相反，它指的是很具体的，集体的，社会的拯救,把一个国家从苦难和压迫中解救出来，尤其是那些在外族统治者奴役下的。

耶鲁公开课 - 旧约导论课程节选

But just to make it concrete and to see what's at stake, consider the distribution of wealth in the United States.

但为了更形象，看看问题何在，以美国的财富分配状况为例。

耶鲁公开课 - 公正课程节选

The design is a mix of concrete pathways, ample seating areas and architectural features.

BBC: New York��s floating freight line

The house features walls of concrete blocks, many with a cross pattern that lets light through.

WSJ: The Pleasures and Pitfalls of Frank Lloyd Wright Homes

But inside these towers of concrete and glass, people create community, art and meaning.

FORBES: The view from the window