sap wood

常见例句

• 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。
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