/ˈkɑːn.kriːt/
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。
noun
building material that is made by mixing together cement, sand, small stones and water 混凝土
a slab of concrete
混凝土板