常見例句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(zhì)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，范圍從邊材一直到髓心。 返回 sap wood