他们还可以记录下很多植物的年生长周期。
Records of the yearly growth cycles of many plants are also available.
同树木一样，石笋通常也有能显示其年生长周期的年轮。
Like trees, stalagmites are often composed of concentric layers that represent annual growth periods.
年生长周期明显缩短。
苗木生长期可分为出苗期、生长初期、生长盛期、生长后期和休眠期5个阶段，年生长周期245天。
There are 5 stages, such as seedling stage, early stage, peak stage, late stage and rest stage in its growing season. The annual growing season has 245 days.
苗木生长期可分为出苗期、生长初期、生长盛期、生长后期和休眠期5个阶段，年生长周期245天。
There are 5 stages, such as seedling stage, early stage, peak stage, late stage and rest stage in its growing season. The annual growing season has 245 days.
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