sapwood; the soft, newer wood in the trunk of a tree found between the bark and the hardened heartwood.
日本語の意味
樹皮と硬い心材の間に位置する、若く柔らかい木の部分（サップウッドに相当）
英語の意味
sapwood; the soft, newer wood in the trunk of a tree found between the bark and the hardened heartwood.
