That means liquid water could exist at the surface, raising the possibility for life.
这意味着，它的表面或许能够存在液态水，从而提高了存在生命的可能性。
White holes have never been observed, though general relativity predicts they could exist in principle.
人们从未观测到过白洞，然而广义相对论认为白洞原则上是存在的。
We are appalled that such conditions could exist among us.
我们中间居然存在如此恶劣的生活状况，真令人不胜惊愕。
We are appalled that such conditions could exist among us.
我们中间居然存在如此恶劣的生活状况，真令人不胜惊愕。
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