慢工出细活，依照春木或夏木、直纹或曲纹、节疤、年轮以及自身瑕疵的不同，各种木材都会被物尽其用，并顺其自然。
Wood moved slowly, but not equally, with its mixture of springwood and summerwood, straight and wavy grain, knots, rings and imperfections. And it would always go the way it was naturally inclined.
解剖树木生长过程木材密度变化规律，研究年轮内密度的变化十分重要。
So it is very important to find out the variation regulation of wood ring density in growth process.
讨论了年轮宽度与木材强度性能和干缩性能的关系。
Whether annual ring width markedly affects both strength properties and shrinkage properties of the wood is discussed.
上面在原木截面上演示了三个典型的切割方式的木材的干缩变形效果，请注意每种切割方式的年轮的朝向以及其对变形形状的影响。
Shrinkage distortion typical for three cuts of lumber is illustrated in this log cross section. Note the curvature of the annual rings in each cut and how that affects the distorted shape .
东北桦呈黄褐色，生长年轮略明显，木材有光泽，纹理直，结构细而均匀，但硬度稍差。
Northeastbirch is tawny, growth ring slightly obvious. Shiny wood, straighttexture, fine structure and uniformity, poor hardness.
东北桦呈黄褐色，生长年轮略明显，木材有光泽，纹理直，结构细而均匀，但硬度稍差。
Northeastbirch is tawny, growth ring slightly obvious. Shiny wood, straighttexture, fine structure and uniformity, poor hardness.
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