extinction of right to

Northern right whales, hunted to near extinction, are the rarest of all large whales. Experts estimate that only several hundred exist in the wild.

鲸鱼图片美术馆。北方的脊美鲸，猎物接近消失，脊美鲸是全部的大鲸鱼中稀罕珍贵的。专家估计只有几百条存在于自然环境下。

The right of formation is the rights that the obligee, based on his or her unilateral declaration of will, can lead to the establishment, the change and extinction of legal relationship.

所谓形成权，即指权利人凭借其单方意思表示就能导致法律关系发生、变更或消灭的那些权利。

Right now, we have this opportunity to prevent the extinction of countless species and ecosystems that are only just being discovered, let alone understood.

现在，我们有这个机会防止刚被发现，更不用说了解的无数物种和生态系统。