B2 a very hard building material made by mixing together cement, sand, small stones, and water混凝土
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The bomb shelter has concrete walls that are three metres thick.
The foundation of the house is built from rubble overlaid with concrete.
A row of reinforced concrete pillars supports the bridge.
Weeds were pushing up through the cracks in the concrete.
Don't walk on the concrete until it has set.
to cover something in concrete用混凝土覆蓋
C1 clear and certain, or real and existing in a form that can be seen or felt確定的,確實的;具體的,有形的,實在的
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It is sometimes easier to illustrate an abstract concept by analogy with something concrete.
He drew attention to the absence of concrete evidence against the defendant.
I have a suspicion that he's having an affair, though I don't have any concrete proof.
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