例句：
It makes our life fragile, ephemeral, and as a result of that, more precious.
它让我们的生命脆弱，短暂，因此而更珍贵。
But all kinds of fame are ephemeral.
但是，各种名望都是短暂的。
The Pleistocene Epoch was an ice age.
更新世是一段冰河时代。
It was meant to sound like an epoch-making declaration.
有意让它听起来像是一个划时代的宣言。
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