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。It's a gross oversimplification to fasten on to the red deer as a threat to the environment.仅关注马鹿威胁环境的一面过于片面了。It's going to be the death knell of the red deer.这将导致马鹿的灭绝。