自然气候的变化也已经在某些物种中间减轻了影响，但是在任何时刻我们都一直可以帮助它们渡过灾难。
Naturally climatic changes have also played their part in the reduction in some species, but at any time we have been able to help them overcome adversity.
麦克·金南博士说，在某些情况下，向一个国家引进外来物种的人的动机是好的，但导致了灾难性的后果。
Dr MacKinnon says in some cases, alien species have been introduced to a country by people with good motives in mind, but they lead to disastrous results.
于是有学者提出了这样一种令人惊讶的可能性，是不是所有恐龙的祖先都拥有细长的羽毛，只是某些物种在进化过程中渐渐失去了这些羽毛。
This raised the astonishing possibility that the ancestor of all dinosaurs had hairlike feathers and that some species lost them later in evolution.
应用推荐