The carbon density decreasing from the top to the bottom in following order: Oak tree Camphor tree Chinese sweet gum Chinese fir Masson pine Slash pine.
碳密度从大到小的排列顺序为:栎林樟树枫香杉木马尾松湿地松。
Frankincense is a type of sweet-smelling gum from a tree.
乳香是从树上提炼的一种有甜味的树脂.
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