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 確實的，具體的（而非想象或猜測的） concrete evidence/proposals/proof 確鑿的證據；具體的建議；確實的證明 ‘It's only a suspicion,’ she said, ‘nothing concrete.’ “那只是懷疑，” 她說，“沒有任何確實的依據。” It is easier to think in concrete terms rather than in the abstract. 結合具體的事物來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. 到會議結束時已經提出了一些相當具體的建議。 This is an urban tragedy that needs concrete action, not just concern. 這是一場城市悲劇，需要具體行動，而不僅僅是關注。
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a concrete object is one that you can see and feel 有形的；實在的
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.