seeding-growth
... 天然有机化学 natural organic chemistry; 天然幼树 seeding-growth; 天然杂交 natural crossing; ...
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沙地云杉天然更新幼苗、幼树呈群状分布，且死亡率高。
The results are as follows:(1) The seedlings and young trees take on a cluster distribution with a high, mortality.
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