We all believe we live in an exceptional time, perhaps even a critical moment in the history of the species.

我们都喜欢相信我们生活在一个特殊的时间，甚至也许是人类有史以来最为关键的时刻。

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Romantic love both exhilarates and motivates us. It is also critical to the continuation of our species.

浪漫的爱在给人以快乐与鼓舞的同时，也关乎着我们种族的延续。

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Species can be lost forever, and with it, possible cures for disease, insights into the history of evolution, critical members of ecosystems.

物种一旦消失就再也找不回来了，随物种一同丢失的可能还有某种疾病的治愈之法、对进化史的新见解、生态链中的其他关键角色等等。

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Welfare campaigners have welcomed the move as a critical step to save these species.

BBC: Turtle 'victory' at wildlife meeting

The site is critical for the survival of several species of endangered waterbirds, to which the key threat is large-scale egg and chick collection by villagers.

UNESCO: OFFICE IN PHNOM PENH

The wetland, which includes the coastal Unryul Migratory Birds Reserve, play an important conservation role as habitats for shore birds and critical areas for many migratory bird species of north-east Asia such as black-faced spoonbill (Platalea minor), Chinese egret (Egretta eulophotes) and red-crowned crane (Grus japonensis).

UNESCO: Natural Sciences