By cross-breeding with our native red deer, the sika deer have affected the gene pool.梅花鹿通过与我们本土的马鹿杂交, 已经影响了鹿群的基因库。

Dr Russel is creating an elite herd by cross-breeding goats from around the globe.拉塞尔博士正在通过对世界各地的山羊进行杂交来培育优种羊群。

Attempts to crossbreed it with other potatoes have been unsuccessful.把它与其他土豆杂交的尝试都没有成功。