made of concrete 混凝土制的 a concrete floor 混凝土地面
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based on facts, not on ideas or guesses 确实的，具体的（而非想象或猜测的） concrete evidence/proposals/proof 确凿的证据；具体的建议；确实的证明 ‘It's only a suspicion,’ she said, ‘nothing concrete.’ “那只是怀疑，” 她说，“没有任何确实的依据。” It is easier to think in concrete terms rather than in the abstract. 结合具体的事物来思考要比抽象思考容易些。
Extra ExamplesTopics Doubt, guessing and certaintyc1By the end of the meeting some fairly concrete proposals had been put forward. 到会议结束时已经提出了一些相当具体的建议。 This is an urban tragedy that needs concrete action, not just concern. 这是一场城市悲剧，需要具体行动，而不仅仅是关注。
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a concrete object is one that you can see and feel 有形的；实在的
Word Originlate Middle English (in the sense ‘solidified’): from French concret or Latin concretus, past participle of concrescere ‘grow together’. The noun sense ‘building material’ dates from the mid 19th cent.