| 释义 |
年轮niánlún木本植物的主干由于季节变化生长快慢不同,在木质部的断面显出的环形纹理。年轮的总数大体相当于树的年龄。{annual ring; growth ring; concentric rings seen in the cross-section of the trunk of a woody plant, formed as a result of different growth speeds in different seasons; the number of growth rings approximately representing the age of a tree} |