然而记忆印记理论的确切机制还不清楚。
The exact mechanism underlying engrams is not well understood.
没有人知道生命所引起的物质扩散的理论极限在哪里，也没有人知道我们的太阳最多能支持多少带有生命印记的物质。
Nobody knows what the theoretical limits to the infection of matter by life would be. Nor does anybody know what the maximum amount of life-enhanced matter that our sun could support is.
一种被称为记忆印记的理论认为，记忆的痕迹或碎片以生物物理变化或生物化学变化的形式分布于整个大脑。
One theory holds that memory traces or fragments are distributed throughout the brain as biophysical or biochemical changes called engrams.
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