heartwood 

  1. 名詞
不可數名詞: (樹木的)心材
赤木質

    
                        
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例句

                

                    
    
                                                    
  1. 
                                It is present in the heartwood of Pinaceae.                            
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  2. 
                                The red-hued heartwood is coarse-grained and soft.                            
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  3. 
                                It is known for its red sapwood and black heartwood .                            
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  4. 
                                Heartwood is usually darker in colour than the sapwood.                            
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  5. 
                                Ours are built out of 2 inch thick slab oak heartwood .                            
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