sap wood

常见例句

• Sapwood is the lighter colored wood growing from inside the bark to the heartwood.
  边材色泽较浅，是从树皮到新材之间的木质部分。
• 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，通常色泽较暗，范围从边材一直到髓心。
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