Traditionally only the darkest heartwood—about 10% of each tree—is harvested for instruments.

传统上，仅采伐颜色最深心材（每棵树约 10%）来制作乐器。

Further inside, deeper into the tree, that's the older xylem, and that's the heartwood.

更深处，深入树干内部，那是较老部，也就是心材。

And there's gonna be more knots in that heartwood, too, from branches past.

那心材中也会因过去枝条而形成更多节疤。

Right, and as the cambium is creating more xylem cells, they're going on the outside of the heartwood.

是， 随着形成层不断产生更多部细胞，这些细胞会分布在心材外部。

The third most highly prized of all these precious trees and their heartwoods was the Lao Wo Da Hong Suan Zhi.

这些珍贵树及其心材中，排名第三是老挝大红酸枝。

So you want to cut the sapwood from the heartwood because the heartwood is extraordinarily strong and you use it for

因，望将边材从心材中分离出来，因为心材异常坚固，适合用于需要承受重压柱子、横梁和类似结构。

And when a log gets to the sawmill, they're going to basically separate those two things because there's different uses for sapwood and for heartwood.

当原运到锯厂时，他们基本上会将边材和心材分开处理，因为边材和心材各有不同用途。

Your heartwood is gonna be older, obviously, because you know how you can tell a tree by the rings, those inner rings that we talked about, the xylem.

显然，心材会显得更老，这是显而易见， 因为了解通过年轮来判断一棵树年龄，就是我们之前讨论过那些内部年轮，即部。 对吧，当形成层不断生成更多部细胞时， 它们会位于心材外部。

But when the people of those forests found the infected trees, deep in the heartwood was a kind of wood inside a tree that was richly dark in color.

但当那些森林里居民发现受感染树时，他们发现在树心材深处，有一种颜色深沉浓郁材。