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. 即使借助于同位素時(shí)序分析，但考慮到許多熱帶樹(shù)木沒(méi)有年輪的這一特點(diǎn)很普遍，交叉定年的問(wèn)題仍然很難解決。
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，一種樟屬的亞洲熱帶樹(shù)木的芳香的干燥內層樹(shù)皮，特別是正肉桂和勞木羅肉桂，常磨成粉做香料。
