As mammals evolved they lost the ability to regrow, or regenerate, parts of their body. However, experiments show that it may be possible to regain that ability.
随着哺乳动物的进化，它们失去了再生身体某一部分的能力。然而，实验表明它们有可能重新获得这种能力。
Sometimes happy endings are sad, involve loss and disappointment, teach us that we can't control anyone or their behavior or show us that we are limited in our ability to heal or change others.
有时快乐结局是令人悲伤的；可能也会令人遭受损失和失望；教会我们不能去控制别人和他们的行为；或是让我们知道我们去疗愈或改变他人的能力不足。
Sometimes happy endings are sad, involve loss and disappointment, teach us that we can't control anyone or their behavior or show us that we are limited in our ability to heal or change others.
有时快乐结局是令人悲伤的；可能也会令人遭受损失和失望；教会我们不能去控制别人和他们的行为；或是让我们知道我们去疗愈或改变他人的能力不足。
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