同根派生 sap wood相关词英汉例句Sapwood is the lighter colored wood growing from inside the bark to the heartwood.邊材色澤較淺，是從樹皮到新材之間的木質部分。Heartwood is the mature wood, which is often darker, extending from the sapwood to the pith.心材通常是成熟的木材部分，通常色澤較暗，範圍從邊材一直到髓心。sap wood更多例句