The wood rays are heterogeneous;
木射线较少；
Wood rays of p. armand and p. prokoraiensis on tangential section both had two shapes that was uniserial wood ray and spindle wood ray.
华山松与前红松弦切面上的木射线均呈两种状态，即单列木射线和纺锤形木射线；
If you focus the sun's rays on dry wood with a burning-glass, it will start burning.
如果你用取火镜使太阳光线聚焦在干木头上，木头就会燃烧起来。
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