生长线（growth line）也称“生长纹”。是指晶体内部可以观察到的反映晶体生长过程的线纹。
我们校园、椰树生长线在路上。
和树木不同的是，当你以平行梨晶长端的视线角度观察时，将看不到任何生长线。
Unlike a tree, if one looks parallel to the length of the boule, no lines will be seen.
采用外部生长线估算法测定淡水贝类年龄具有局限性，对年龄偏大或生长较慢的品种不适用。
The method of enumerating growth lines to determine the age of freshwater mussles has its limitation and not applicable to the older specimens and those species with slow growth.
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