Even with the use of isotopic time series the problem of crossdating is still severe, given the nature of locally absent banding that is often severe in many tropical trees. 即使借助于同位素时序分析，但考虑到许多热带树木没有年轮的这一特点很普遍，交叉定年的问题仍然很难解决。
The dried aromatic inner bark of certain tropical Asian trees in the genus Cinnamomum,especially C. verum and C. loureirii,often ground and used as a spice. 桂皮，一种樟属的亚洲热带树木的芳香的干燥内层树皮，特别是正肉桂和劳木罗肉桂，常磨成粉做香料。
