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马尾松是我国南方主要林木之一,但在一些低山区和丘陵区,由于立地条件不好,或松毛虫的危害,形成了稀疏
Masson pine is one of the main trees in southern China, but in some low mountains and hilly areas, due to poor site conditions, or the damage of pine caterpillars, the formation of sparse