自然繁殖
宁在空旷地而不是树冠下自然繁殖。
Reproduce naturally in the open rather than under an overstory.
这些利于野核桃的自然繁殖与更新和保持生态平衡。
These are advantageous to the natural propagation and rejuvenation of wild walnut, and favourable to keeping ecological balance.
金鱼的繁殖，可分为两种繁殖方式，自然繁殖与人工繁殖。
Goldfish breeding reproduction can be divided into two kinds natural reproduction and artificial propagation.
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