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The sapwood is easy to preserve but not the hardwood.
边材易于保存，但是硬材不易保存。
youdao
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It is important to note, color in this explanation refers to sapwood and heartwood.
重要的一点说明是，这里的颜色是指边材和心材的颜色。
youdao
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It is important to note, color in this explanation refers to sapwood and heartwood.
重要的一点说明是，这里的颜色是指边材和心材的颜色。
youdao