The severity of the impact was increased because cattle, which were displacing sheep, are much more sensitive than sheep to the toxins contained in ragwort.
由于正在取代绵羊的牛对千里光草中含有的毒素比绵羊敏感得多，影响的严重程度有所增加。
2
Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species.
某些种类的北极鸟受到近来雪雁数量急剧增加的威胁，这些雪雁在北极繁殖，并且正在取代生命力较弱的鸟类。
3
Displacing such a formidable machine will be extremely difficult.