included sapwood

例句：

1. 1. The tree's trunk is made of a mix of hardwood and softwood, including included sapwood.
   这棵树的树干是由硬木和软木混合制成的，包括含混材。
2. 2.The engineer used the included sapwood to reinforce the structure.
   工程师利用了包含的年轮来加固结构。
3. 3. The woodworker carefully selected the best pieces of wood for their project, including included sapwood.
   木工仔细挑选了最好的木头用于他们的项目，包括含混材。