1. the production of animals or plants by inbreeding or hybridization. 
   通过杂交或近亲交配的动植物的生产。
2. A local, usually stable population of interbreeding organisms of the same kind or species. 
   同类群，混交群体一种区域性的、通常保持人口稳定以及相同种属间杂交繁殖的生物群
3. A taxonomic species considered in terms of its ecological characteristics and usually including several interbreeding ecotypes. 
   生态种按生态学特征划分的分类种，常包括一些杂交生态型
4. A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations. 
   障碍物理或生物因素，可以限制迁移、杂交或个体及群体的自由运动
5. 5-needled pinon of southern California and northern Baja California having (sometimes 3- or 4-needled showing hybridization from Pinus californiarum). 
   加州南部和北部一种五针松（有时与加州单针松的杂交品种为三针或四针）。

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